PROBLEM VIThe time taken, T seconds, to open a graphics programme on a computer is normally distributed with mean20 and standard deviation σ.Given that P(T> 13/7 <27) = 0.8, find the value of:(a) the standard deviation, o(b) the value of k for which P(T> k) = 0.75.

To solve this problem, we need to use the given information about the normal distribution of the…

Answered: PROBLEM VI The time taken, T seconds,…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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what I have is working for other problems but not this one. apparently my standard deviation is off somehow following formulas I have in: standard deviation=SQRT(SUM(F77:F83)/(117-1))
(g) The following question was investigated: If the standard deviation of the mean for the sampling distribution of random samples of size 64 from a large or infinite population is 5, how large must the sample size become if the standard deviation is to be reduced to 0.9. In solving this question, it was determined that n = 1975.308642. Since we cannot talk to a partial person, how many people do we need to sample? (h) Suppose you collect data and want to find P(X < some number) by using the t-distribution. What do we need to assume about the population to make sure we can use the t-distribution? (i) Suppose we want to solve the following: • Find k such that P(x2 < k) = 0.025 where df = 8. Find P(x? < 4.182) where df = 6. What R function would you use in each case to solve these questions? You do not need to actually solve, just write down the R function. An example of an R function is dbinom (this is not the one that you need).
A population of students earned test scores distributed normally with a mean of 65 and a standard deviation of 9. Find the percent of scores with a grade of F. Identify the following variables: μ: σ: x1: x2:z1 = , z2 = The percent of students that earned a grade of F, between 0 and 60, is = % Enter your answers as numbers accurate to 2
A sample of n=20 scores has a mean of M=32 and a standard deviation of s=6. In this sample, what is the z-score corresponding to X=28?
please help me solve this practice question using excel

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PROBLEM VI The time taken, T seconds, to open a graphics programme on a computer is normally distributed with mean 20 and standard deviation σ. Given that P(T> 13/7 <27) = 0.8, find the value of: (a) the standard deviation, o (b) the value of k for which P(T> k) = 0.75.