Question

PLEASE HELP!! I NEED THE ANSWER ASAP
The standard deviation of a population is known to be 7.8. If the sample size is 85, what is the standard error of the mean?

A.0.22

B.0.85

C.1.047

D.6.008

Answer 1

Standard Error of the Mean = SEM = SD/sqrt n 
= 7.8/sqrt 85 
= 0.846 round it up  youll get 0.85

Answer 2

Answer:

0.85

Step-by-step explanation:

We are given that The standard deviation of a population is known to be 7.8.

So, $\sigma = 7.8$

Population size N = 85

Formula of standard error of the mean = $\frac{\sigma}{\sqrt{N}}$

Substitute the values in the formula:

So, standard error of the mean = $\frac{7.8}{\sqrt{85}}$

                                                     = $0.8460$

Thus the standard error of the mean is 0.85

Hence Option B is correct.