Question 13 4 pts Z-scores A variable is normally distributed, with mean 118 and standard deviation...
suppose ACT reading scores are normally distributed with a mean of 21.4 and a standard deviation of 5.9 . A university plans to award scholarships to students who’s scores are in the top 9%. what is the minimum score required for the scholarship? Suppose ACT Reading scores are normally distributed with a mean of 21.4 and a standard deviation of 5.9. A university plans to award scholarships to students whose scores are in the top 9 %. What is the...
Question 3: Consider the Standard Normal Distribution with mean 0 and standard deviation 1. Find the following. a) P (z>0.5) b) P(z 1.5) c) P (-0.49 < z1.5) Question 4: If you have a normal distribution with mean 14 and standard deviation of 2. What is P(x >16)? Question 5 Professor Hardy assumes the exam scores are normally distributed and wants to grade "on a curve." The mean score was 68, with a standard deviation of 9, If he wants...
15) Assume that z scores are normally distributed with a mean of 0 and a standard deviation 15) of 1. If P(z> c) 0.109, find c. olve the problem. 16) 16) Scores on an English test are normally distributed with a mean of 37.4 and a standard deviation of 7.9. Find the score that separates the top 59% from the bottom 41% 17) Suppose that replacement times for washing machines are normally distributed with a 17) mean of 10.9 years...
Assume that z-scores are normally distributed with a mean of O and a standard deviation of 1. If P(0 < z < a) = 0.4857, find a. a = (Round to two decimal places.)
Scores on a homework are normally distributed with a mean of 78 and a standard deviation of 14. What is the standard score ( z score) for an homework score of 66 ?
. Question 11 3 pts Let X be normally distributed with some unknown mean and standard deviation X- o=2. The variable Z = is distributed according to the standard normal A distribution. Enter the value for A = . It is known that P(X > 14) = 0.2 What is P(Z > 7 - ) = (enter a decimal value). Use R to determine di = (round to the second decimal place).
all questions. Do not round answers 1. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. a. What percentage of scores is between 55 and i 15? b. In a group of 20,000 randomly selected individuals, how many have an IQ score of 130 or more? 2. A Honda Civic has its gas mileage (in miles per gallon, or mpg) normally distributed, with a mean of 33 mpg and a standard deviation of...
I. Assume that z is normally distributed with a specified mean and standard deviation. Find the indicated probabilities: c, p(x 120); μ 100 ; ơ--15 2. Find z such that 28% of the standard normal curve lies to the right of z. 3. A person's blood glucose level and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter of blood. After a 12- hour fast, the random variable x will have a...
Use the normal distribution of SAT critical reading scores for which the mean is 504 and the standard deviation is 118. Assume the variable x is normally distributed. (a) What percent of the SAT verbal scores are less than 675? (b) 1000 SAT Verbal scores are randomly selected, about how many would you expect to be greater than 575? (a) Approximately _______ % of the SAT verbal scores are less than 675.
Assume that z scores are normally distributed with a mean of O and a standard deviation of 1. If Pl-a<z<a) = 0.4314, find a. 1.49 0.57 -0.18 0.3328 Question 5 O out of 2 points A coin is tossed 20 times. A person, who claims to have extrasensory perception, is asked to predict the outcome of each flip in advance. She predicts correctly on 16 tosses. What is the probability X of being correct 16 or more times by guessing?...