Question

the mean of hundred numbers is 45 the mean of the last 99 numbers is 44 the first number is​

Answer 1

Answer:

144

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Step-by-step explanation:

Let a be the first number, and let "b, c, ... , d" represent the other 99 numbers.

Mean of the 100 numbers is 45

=> ( a + b + c + ... + d ) / 100 = 45

=>  a + b + c + ... + d = 4500            ... (1)

Means of the last 99 numbers is 44

=>  ( b + c + ... + d ) / 99 = 44

=>  b + c + ... + d = 44 × 99 = 4356              ... (2)

Subtracting equation (2) from equation (1) gives

a = 4500 - 4356 = 144