Question

sum of observation s are 150 and mean 15 then find number of observations

Answer 1

Mean =(sum of obsercation ) / ( no. of observation)
15=150/(no. of observations)
no. of observation = 150/15 = 10

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Answer 2

Let the number of observations be n

Sum of observations = 150

mean = 15

We know that

Mean = sum of observations ÷ number of observations

=> 15 = 150 ÷ n

=> n = 150 ÷ 15

=> n = 10

hence, number of observations is 10.