Question

2. Calculate one of each of the following questions created by 3 different classmates. a. Mean...

2. Calculate one of each of the following questions created by 3 different classmates.

a. Mean and standard deviation given, looking for the percentage between two x values.

Marks in a class is normally distributed with a mean mark of 71 and standard deviation of 11. 3

What percent of students scored between 65 - 75%?

b. Mean and standard deviation given, looking for the percentage above a certain x value.

The heights of 17-year-old boys' heights are normally distributed with a mean of 175cm and a standard deviation of 7.11cm.

What percent of the 17-year-old boys are above 179cm?

c. Mean and standard deviation given, looking for the x value at a certain percentile.

The length of time it takes for students who ride the bus to get to school is normally distributed with a mean of 25 mins and a standard deviation of 5 mins.

What time would be lower than 60% of all the other times?

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Heights for college women are normally distributed with a mean of 65 inches and standard deviation...
Heights for college women are normally distributed with a mean of 65 inches and standard deviation of 2.7 inches. Find the 25th percentile. Suppose that the time students wait on a bus can be described by a uniform random variable X, were X is between 0 and 60 minutes. What is the probability they will have to wait between 25 and 35 minutes for the next bus?
In Country​ A, the population mean height for​ 3-year-old boys is 38 inches. Suppose a random...
In Country​ A, the population mean height for​ 3-year-old boys is 38 inches. Suppose a random sample of 15​ 3-year-old boys from Country B showed a sample mean of 37.1 inches with a standard deviation of 3 inches. The boys were independently sampled. Assume that heights are Normally distributed in the population. Complete parts a through c below. a.Determine whether the population mean for Country B boys is significantly different from the Country A mean. Use a significance level 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...
Cherry trees in a certain orchard have heights that are normally distributed with mean μ =...
Cherry trees in a certain orchard have heights that are normally distributed with mean μ = 109 inches and standard deviation σ = 11 inches. Use the Cumulative Normal Distribution Table to answer the following. (a) Find the 23 rd percentile of the tree heights. (b) Find the 81 st percentile of the tree heights. (c) Find the second quartile of the tree heights. (d) An agricultural scientist wants to study the tallest 2 % of the trees to determine...
In Country​ A, the population mean height for​ 3-year-old boys is 37 inches. Suppose a random...
In Country​ A, the population mean height for​ 3-year-old boys is 37 inches. Suppose a random sample of 15​ 3-year-old boys from Country B showed a sample mean of 36.8 inches with a standard deviation of 4 inches. The boys were independently sampled. Assume that heights are Normally distributed in the population. Complete parts a through c below. a. Determine whether the population mean for Country B boys is significantly different from the Country A mean. Use a significance level...
In the US, the population mean height for 3-yr-old boys is 38 inches. Suppose a random...
In the US, the population mean height for 3-yr-old boys is 38 inches. Suppose a random sample of 15 non-US 3-yr-old boys showed a sample mean of 37.2 inches with a standard deviation of 3 inches. Assume that the heights are normally distributed in the population. After conducting the hypothesis testing to determine whether the population mean for non-US boys is significantly different from the US population mean, we fail to reject the null hypothesis at 0.05 level. If you...
1. Given that the heights of 300 students are normally distributed with a mean of 68.0...
1. Given that the heights of 300 students are normally distributed with a mean of 68.0 inches and a Standard Deviation of 3.0 inches, determine how many students have heights... (a) ... greater than 71 inches (b) ... less than or equal to 65 inches (c) ... between 65 inches and 71 inches inclusive (d) ... between 59 inches and 62 inches inclusive Assume the measurements are recorded to the nearest inch. 2. If the mean and standard deviation of...
1. Men’s heights are normally distributed with a mean of 69" and a standard deviation of...
1. Men’s heights are normally distributed with a mean of 69" and a standard deviation of 2.5". Draw the distribution curve; label the mean and 3 standard deviations above and below the mean. Answer the following question: a. Between what heights do 68% of men fall? b. What percentage of men are shorter than 74"? c. What percentage of men are taller than 65"? 2. The middle 95% of adults have an IQ between 60 and 140. Assume that IQ...
Question 7 The mean monthly rent for a one-bedroom apartment without a doorman in Manhattan is...
Question 7 The mean monthly rent for a one-bedroom apartment without a doorman in Manhattan is $ 2,642 . Assume the standard deviation is $500. A real estate firm samples 100 apartments. What is the probability that the average rent of the sample is more than $ 2,710 ? Write only a number as your answer. Round to 4 decimal places (for example 0.1048). Do not write as a percentage. Question 8 A survey among freshmen at a certain university...
Exam grades across all sections of introductory statistics at a large university are approximately normally distributed...
Exam grades across all sections of introductory statistics at a large university are approximately normally distributed with a mean of 72 and a standard deviation of 11. Use the normal distribution to answer the following questions. (a) What percent of students scored above an 87 ? (b) What percent of students scored below a 60 ? (c) If the lowest 8% of students will be required to attend peer tutoring sessions, what grade is the cutoff for being required to...