Question

What is the Mean of this number sequence: 4, 2, 2, 2, 5, 15

Answer 1

given sequence- 4,2,2,2,5,15
mean = sum of all obsv./total no. of obsv.
mean=4+2+2+2+5+15/6=30/6=5

answer=5


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Answer 2

mean is the ratio of sum of observations to total number of observations.

e.g., $\textbf{mean}=\frac{\text{sum of observations}}{\text{number of observations}}$

here observations are : 4, 2 , 2 , 2, 5, 15
sum of observations = 4 + 2 + 2 + 2 + 5 + 15 = 30
total number of observations = 6

mean = 30/6 = 5