Question

If the mean of the first 'n' natural numbers is 15, then find 'n'

Answer 1

Answer:

Mean of first n natural number is 15. To Find :-Value of n. Formula to be used :-Mean = Sum of all the observations/ Total number of observations Mean = (1 + 2 + 3 + ……+ n )/n. Mean = (n/2 (n + 1)) / n Solution :-Putting all the values, we get. Mean = (n/2 (n + 1)) / n ⇒ 15 = (n + 1) /2 ⇒ n + 1 = 30 ⇒ n = 30

Step-by-step explanation:

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