X=379.2/n
N=379.2/x
I hope that helps
The answer and equation is 17 - 19 = -2
Answer:
a) Sample mean: 48.71
Sample median: 48.3
Sample variance: 5.41
Sample standard deviation: 2.37
Step-by-step explanation:
a) Sample mean:

Sample median: M=48.3
Note: I order the data increasingly and take the value N / 2 = 40. In this way there are 39 values above and 39 values below the median.
Sample variance:

Sample standard deviation

b)
15c
The team has fifteen members and each member sells an unknown amount of coupon books.