(a) Approximately what percentage of these vehicle speeds were between 31 and 57 mph? approximately  % (b) Approximately what percentage of these vehicle speeds exceeded 57 mph? (Round your answer to the nearest whole number.) approximately  %

QUESTION 1 A health researcher read that a 150-pound college-aged, male can burn an average of 530 calories per hour playing tennis with a standard deviation of 25 calories. 40 college-aged males were randomly selected at a commuter school and the mean number of calories burned per hour playing tennis was 540 calories.  Do college-aged male tennis players at the commuter school burn more calories per hour than the college-aged, male tennis player population? Test with a 0.05 significance level.  What are the hypotheses? Null and Alternate

Do question 3

Among applicants to a school of public health, the average GRE writing score was about 3, the SD was about 0.5, and the lowest score was 2.5. True or False: the GRE writing scores follow the normal curve. Select one: True False Brevious page Next page C

Suppose there is a city where the mean cost per month of a one-bedroom apartment is $1,500, with a standard deviation of $250. Approximately what percentage of one-bedroom apartments in the city cost between $750 and $1,000?

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b. In a class of twenty-five 15-year old girls the average height is M = 62.60 inches. The national average for girls at this age is reported as follows: µ = 63.80 inches with a standard deviation, s = 2.66 inches.     Compute z score

Question 2 The weekly rental prices of rental properties are normally distributed with a mean of $250 and a standard deviation of $50. Calculate the percentage of properties with weekly rental price lower than $150 per week. Answer: Click or tap here to enter text.   Calculate the percentage of properties with weekly rental price higher than $300 per week. Answer: Click or tap here to enter text.   Calculate the percentage of properties with weekly rental price between $150 and $300 per week. Answer: Click or tap here to enter text.

The results from a statistics class’ first test are as follows: The average grade obtained on the test by its 45 students is an 85, with a standard deviation of 15 points. Answer the following based on this information: a. Approximately how many people received a failing grade (less than 65) b. What percentage of people received a grade between a 70 and a 91? c. What percentage of individuals received a score whose z-score was -.70 or less? d. What grade is required in order to be in the top 15 percent? The top 10 percent? e. What percentage of people received a grade between 85 and 95? f. What percentage of people received a grade of 94 or less? g. What grade is required to be in the bottom 20%? h. What z-score is required to be in the top 40%? i. What percentage of individuals have a z-score between -1 and 1.40? j. What percentage of individuals have a z-score between 1.05 and 1.40?