Question

(Question 14) 2 pts In a survey of first graders, their mean height was 51.6 inches...

(Question 14) 2 pts In a survey of first graders, their mean height was 51.6 inches with a standard deviation of 3.6 inches. Assuming the heights are normally distributed, what height represents the first quartile of these students? 54.03 inches 49.17 inches 48.00 inches 48.57 inches Flag this Question

(Question 15) 2 pts Hospital waiting room times are normally distributed with a mean of 38.12 minutes and a standard deviation of 8.63 minutes. What is the shortest wait time that would still be in the worst 5% of wait times? 46.75 minutes 52.32 minutes 29.49 minutes 23.92 minutes

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

(Question 14) 2 pts In a survey of first graders, their mean height was 51.6 inches with a standard deviation of 3.6 inches. Assuming the heights are normally distributed, what height represents the first quartile of these students?

54.03 inches

Answer: 49.17 inches

48.00 inches

48.57 inches

z value for first quartile = -0.674

x = mean+z*sd = 51.6-0.674*3.6 = 49.17

(Question 15) 2 pts Hospital waiting room times are normally distributed with a mean of 38.12 minutes and a standard deviation of 8.63 minutes. What is the shortest wait time that would still be in the worst 5% of wait times?

46.75 minutes

52.32 minutes

29.49 minutes

Answer: 23.92 minutes

z value for lower 5% = -1.645

x = mean+z*sd = 38.12-1.645*8.63 = 23.92

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Suppose that the mean height of all 6th graders is 46 inches with a standard deviation...
Suppose that the mean height of all 6th graders is 46 inches with a standard deviation of 2.5 inches. It is reasonable to assume that these heights are normally distributed. Find the percentage of 6th graders who are under 47 inches tall. (round to three decimal places)
Question 1 2 pts Let x represent the height of first graders in a class. This...
Question 1 2 pts Let x represent the height of first graders in a class. This would be considered what type of variable: Nonsensical Lagging Continuous Discrete Flag this Question Question 2 2 pts Let x represent the height of corn in Oklahoma. This would be considered what type of variable: Discrete Inferential Distributed Continuous Flag this Question Question 3 2 pts Consider the following table. Age Group Frequency 18-29 9831 30-39 7845 40-49 6869 50-59 6323 60-69 5410 70...
In a survey of women in a certain country​ the mean height was 65.9 inches with...
In a survey of women in a certain country​ the mean height was 65.9 inches with a standard deviation of 2.72inches. Answer the following questions about the specified normal distribution. ​(a) What height represents the 85th ​percentile? ​(b) What height represents the first​ quartile?
The length of timber cuts are normally distributed with a mean of 95 inches and a...
The length of timber cuts are normally distributed with a mean of 95 inches and a standard deviation of 0.52 inches. In a random sample of 30 boards, what is the probability that the mean of the sample will be between 94.7 inches and 95.3 inches? 0.002 0.950 0.436 0.998 Flag this Question Question 182 pts The Dow Jones Industrial Average has had a mean gain of 432 pear year with a standard deviation of 722. A random sample of...
The distribution of young woman's height is normally distributed with a mean of 65 inches and...
The distribution of young woman's height is normally distributed with a mean of 65 inches and a standard deviation of 2.5 between what height do 95% of young women fall and what percentage of young women are shorter and 65 68-95-99.7 rule The IQ score of seven graders normally distributed with a mean of 111 standard deviation of 11 what percentage IQ score above 144 in a sample of 75 students in a rural school none had scored above 144...
The heights of kindergarten children are approximately normally distributed with a mean height of 39 inches...
The heights of kindergarten children are approximately normally distributed with a mean height of 39 inches and a standard deviation of 2 inches. If a first-time kindergarten teacher finds the average height for the 20 students in her class is 40.3 inches, would that be unusual? Explain. ANSWER 0.0018 please show step by step ! thank you
(Question 7) 2 pts In a sample of 41 temperature readings taken from the freezer of...
(Question 7) 2 pts In a sample of 41 temperature readings taken from the freezer of a restaurant, the mean is 29.7 degrees and the standard deviation is 2.7 degrees. What would be the 80% confidence interval for the temperatures in the freezer? (29.16, 30.24) (24.30, 35.10) (27.00, 32.4) (31.36, 32.44) Flag this Question (Question 8) 2 pts What is the 99% confidence interval for a sample of 36 seat belts that have a mean length of 85.6 inches long...
The average height of an adult male in the United States is 70 inches, with a...
The average height of an adult male in the United States is 70 inches, with a standard deviation of 3 inches. Assume that male heights are Normally distributed. Approximately what proportion of males are expected to be under 76 inches? To aid your answer, hand-draw to sketch a Normal curve, and shade in the area under the Normal density curve the question represents. Add dashed lines at the mean +/- 1SD, 2SD and 3SD. Then calculate the proportion asked about...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT