Mathematics Question on Mean, median, mode and standard deviation

Question

Consider the following hypothesis test:
$Η_0: μ ≤ 20$
$Η_1 : μ > 20$
A sample of 81 produced a sample mean of 20.55. The population standard deviation is 3. The value of the test statistic is:

Answer 1

Solution

The correct option is (D):

1.65