A sample of n = 7 scores has a mean of M = 9 What is the value of EX for this sample

Question

not sure how to solve wither to multiply 7 and 9 or what to do

Answer 1

Do you intend to be asking about Expectation, E(X)?  or ΣX ?

 

For a binomial distribution, E(X) = np where p = probability of success & n = # of (Bernoulli) trials.

 

For a normal distribution, E(X) = μ which is the mean, also known as "x bar"

 

When in doubt, the word WHETHER will be employed; WITHER is what happens to an unwatered plant (other than cactus).