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Textbook Expert
Textbook ExpertVerified Tutor
31 Oct 2021

Given information

Here, mean of unknown distribution( )= 12

Standard deviation()= 1

Sample size (n)= 25

Step-by-step explanation

Step 1.

Suppose X is a random variable with a distribution that may be known or unknown (it can be any distribution) and suppose:

  1. μX = the mean of Χ
  2. σΧ = the standard deviation of X

If you draw random samples of size n, then as n increases, the random variable ΣX consisting of sums tends to be normally distributed,and

 

  1.  

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