Question

if the mean of first X natural number is 15 then find x​

Answer 1

Answer:

x=5

Step-by-step explanation:

1+2+3+4+5=15

Answer 2

Answer:

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Step-by-step explanation:

$\red\bigstar$ Mean = Sum of total number of terms / Number of terms

$\red\star$ Given Number of terms = X

$\red\bigstar$ Sum of first N natural numbers = N(N+1)/2

$\implies$ Therefore Mean = [X(X + 1)/2]/X = (X+1)/2

$\red\star$ But given mean = 15

$\implies$ (X+1)/2 = 15

$\implies$ X = 30 - 1

$\implies$ X = 29