Question

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?

Answer 1

0.85. My be this is the answer

Answer 2

Answer: b. 0.85

Step-by-step explanation:

The formula to calculate the standard error is given by :-

$S.E.=\dfrac{\sigma}{\sqrt{n}}$

We are given that the standard deviation of a population : $\sigma = 7.8$

The sample size = 85

Therefore. the standard error of the mean is given by :-

$S.E.=\dfrac{7.8}{\sqrt{85}}=0.846028785493\approx0.85$

Hence, the standard error of the mean = 0.85