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MATH SOLVE
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Question 14 Yoko's final exam has true/false questions, worth 4 points each, and multiple choice questions, worth 5 points each. Let x be the number of true/false questions she gets correct, and let y be the number of multiple choice questions she gets correct. She needs at least 85 points on the exam to get an A in the class. Using the values and variables given, write an inequality describing this.
General
2 months ago
The time to failure, t, in hours, of a machine is often exponentially distributed with a probability density function f(t) = k e^(-kt), 0 to infinity, where k= 1/a and a is the average amount of time that will pass before a failure occurs. Suppose that the average amount of time that will pass before a failure occurs is 80 hr. What is the probability that a failure will occur in 55 hr or less?
General
2 months ago
A sample was taken of the salaries of 20 employees from a large company. The following are the salaries (in thousands of dollars) for this year (the data are ordered). 28 31 34 35 37 41 42 42 42 47 49 51 52 52 60 61 67 72 75 77 Suppose each employee in the company receives a $3000 raise for next year (each employee's salary is increased by $3000). The interquartile range of the salaries will ____
General
2 months ago
gabriel operates riverboat and frequently offers tours of the river. Typically, a tour lasts for 3.25 hours. The riverboat ssually takes 2.00 hours to make the 25- mile trip from the dock and 1.25 hours to make the 25/ mile return trip doenstream. Gabriel is considering offering a shoorter tour that will last 2/50 hours and travel only 20 miles upstream before returning. will the shorter tour be possible if the riverboat travels at ther same speed as it does in the 3.25- hour tour?
General
2 months ago
What are the solutions? 16x^2+9=0
General
2 months ago
Claudia was cooking breakfast for her entire family. She made double the amount of chocolate chip pancakes as she did regular pancakes. She only made half as many blueberry pancakes as she did regular pancakes. Claudia also knows her family loves sausage, so she made triple the amount of sausage as blueberry pancakes.a. How many of each breakfast item did Claudia make if she cooked 90 items in total?b. After everyone ate breakfast, there were 4 chocolate chip pancakes, 5 regular pancakes, 1 blueberry pancake, and no sausage left. How many of each item did the family eat?
General
2 months ago
Use the "mixed partials" check to see if the following differential equation is exact. If it is exact find a function F(x,y) whose level curves are solutions to the differential equation. (−3xy^2+y)dx + (−3x^2y+x)dy =0
General
2 months ago
Serena’s mom is planning her birthday party. She bought balloons, plates, and cups. Serena’s mom bought twice as many plates as cups. The number of balloons Serena’s mom bought was half the number of cups.a. If Serena’s mom bought 84 items, how many of each item did she buy?b. Tammy brought 12 balloons to the party. How many total balloons were at Serena’s birthday party?c. If half the plates and all but four cups were used during the party, how many plates and cups were used?
General
2 months ago
Consumer Reports uses a 100-point customer satisfaction score to rate the nations major chain stores. Assume that from the past experience with the satisfaction rating score, a population standard deviation of 12 is expected. In 2012, Costco with its 432 warehouses in 40 states was the only chain store to earn an outstanding rating for overall quality. A sample of 15 costco customer satisfaction scores follow:95 90 83 64 9598 80 83 82 9386 80 94 75 62(A) What is the sample mean customer satisfaction score for Costco?(B) What is the sample variance?(C) What is the sample standard deviation?
General
2 months ago
The weight of an organ in adult males has a bell-shaped distribution with a mean of 330 grams and a standard deviation of 15 grams. Use the empirical rule to determine the following. (a) About 68% of organs will be between what weights? (b) What percentage of organs weighs between 285 grams and 375 grams? (c) What percentage of organs weighs less than 285 grams or more than 375 grams? (d) What percentage of organs weighs between 300 grams and 375 grams?
General
2 months ago
one scuba diver descends from 135 feet below sea level at a rate of 1 foot per 2 seconds. Along the same path (but in the opposite direction) another scuba diver descends from sea level at 4 feet per second. In how many seconds will the scuba divers be at the same place?
General
2 months ago
Suppose that the mean of the sampling distribution for the difference in two sample means is 0. This tells us that:A. the two sample means are both 0.B. the two sample means are equal to each other.C. the two population means are both 0.D. the two population means are equal to each oth
General
2 months ago
In 2015, an estimated 7,620,000 travel books and 4,660,000 humor books were sold. 2960000 Compare the number of travel books to humor books using absolute change. Write your answer only as a positive or negative number (no units). Compare the number of travel books to humor books using relative change. Write your answer as a percentage rounded to the nearest tenth.
General
2 months ago
motion problem Two trains leave Boston at the same time traveling in opposite directions. One train travels qt a rate of 35 miles per hour, while the other train travels at a ratw of 63 miles per hour. How many hours will it be before the trains are 441 miles apartCan someone please explain how to do this problem?
General
2 months ago
Place the numbers 1,2,3,4,5 and six in six spaces so that each side gives the same sum
General
2 months ago
3rd grade math? My daughter and I couldn't figure this out. Help?
General
2 months ago
Superman needs to save Lois from the clutches of Lex Luthor. After flying for 5 seconds, he is 1845 meters from her. Then at 15 seconds he is 1335 meters from her.
General
2 months ago
If I bought shoes for 32.30 with 15% off 7%sales tax a 25dollar gift card but had a coupon that was forgotten for 5%off the original price what should have I paid
General
2 months ago
A biologist is studying the levels of heavy metal contaminants among a population of the South Nakaratuan Chubby Bat. The biologist is interested in constructing a simple linear regression model to investigate the relationship between weight of an animal and the level of heavy metal contamination. In the proposed regression model the level of contaminant is the response variable and weight is the explanatory variable. The contaminant level is measured in parts per billion (ppb) and weight in grams.A random sample of 20 individuals is selected and measurements are taken.Download the dataContaminant study inSouth Nakaratuan Chubby BatContaminant level(ppb) Weight(g)138 101224 145166 112201 138210 129167 120161 110217 141197 127166 118213 143202 124213 132189 120178 124236 148193 137160 117163 121247 103Plotting the data, the researcher notices an obvious outlier. They decide to do the regression analysis with and without the outlier and compare the results.Calculate the slope (b1) and intercept (b0) of the simple regression equation using the data provided. Give your answers to 2 decimal places.a)Slope = b1 =b)Intercept = b0 =Find the proportion of variation in the values of contaminant level that is explained by the regression model. Give your answer as a decimal to 2 decimal places.c)R2 =Repeat this process omitting the outlier:d)Slope = b1 =e)Intercept = b0 =Find the proportion of variation in the values of contaminant level that is explained by the regression model. Give your answer as a decimal to 2 decimal places.f)R2 =
General
2 months ago
A study measuring fitness level in teens randomly sampled 100 female teens and 102 male teens with a higher score indicating more fitness. Researchers suspected that the fitness level for female teens is lower than for male teens, and wanted to check whether the data would supported this hypothesis. If μ1 and μ2 represent the mean fitness level for female teens and male teens respectively, which of the following is an appropriate pair of hypotheses in this case?A. H0: µ1 − µ2 = 0 Ha: µ1 − µ2 < 0B. H0: µ1 − µ2 < 0 Ha: µ1 − µ2 = 0C. H0: µ1 = µ2 Ha: µ1 > µ2D. H0: µ1 − µ2 = 0 Ha: µ1 - µ2 > 0
General
2 months ago
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