percentage of the mean its formulasCV= 100% The [x) calculates the standard deviation as a -×...
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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...
IQ-scores are standard-score transformed scores having a mean of 100 and a standard deviation of 15; SAT scores are standard-score transformed scores having a mean of 500 and a standard deviation of 100. In what follows, X refers to a raw score from a distribution with a mean of X and a standard deviation of S, and SAT and IQ refer to the corresponding transform of that score. Solve for the missing value in each of the following: (a) X=-2.5;Xmean=...
iq scores are normally distributed with a mean of 100 and a standard deviation of 15. what percentage of people have between 60 and 85 or above 100. show work
Find the mean, variance and standard deviation for the random variable X: Random Variable X -2 1 3 P(X = x) 0.1 0.3 .6 Show the calculations that you need for each part. You will get no credit for using your calculator or Excel and only giving the answer. You should write out: mean = ........ (show how the mean is calculated) Vairance = .............. Standard Deviation = ................
If x has a normal distribution with mean=146 and standard deviation = 40.86 , find P (100 < x < 146) * 2 points Your answer The life span of CASIO calculators has a normal distribution with average 2 points of 54 months and standard deviation of 8 months. What percentage of calculators will last for at most 36 months? * 98.93% O 1.07% O 1.22% 0 98.78% 100%
An IQ test has a mean of 100 and a standard deviation of 15? Jadon has an IQ of 100. What percentage of the population is smarter than him?
Suppose X is a normal random variable with mean = 100 and standard deviation = 20. What is the Z-value for X= 90? a) 0.5 b) -0.5 c) 5 d) -5
The mean IQ score of adults is 100 , with a standard deviation of 15 . Use the Empirical Rule to find the percentage of adults with scores between 85 and 115 . (Assume the data set has a bell-shaped distribution
Write a program that takes as input five numbers and outputs the mean (average) and standard deviation of the numbers. If the numbers are X_1, X_2, . X_3, X_4, X_5 then the mean is equal to X = (X_1 + X_2 + X_3+ X_4 + X_5)/5 and the standard deviation is: squareroot (Xl - X)^2 + (X2 - X)^2 + (X3 - X)^2 + (X4 - X)^2 + (X5 - X)^2 Your program must contain at least the following functions:...
A variable has a mean of 100 and a standard deviation of 15. Nine observations of this variable have a mean of 116 and a sample standard deviation of 12. Determine the observed value of the a. standardized version of x overbar. b. studentized version of x overbar.