1.

If one prime number is replaced by a number from the series of first five prime numbers then the average becomes 5.8. Find the replaced number.1). 92). 03). 64). 4

Answer»

Average = (sum of elements)/(number of elements)

Given,

The average of the first five prime NUMBERS is 5.6 -

The first five prime number are 2, 3, 5, 7 and 11.

Total sum of first five prime numbers = 2 + 3 + 5 + 7 + 11 = 28

New average after replacement = 5.8

Total sum of five numbers = 5.8 × 5 = 29

The DIFFERENCE between the sum of five numbers = 29 - 28 = 1

∴ The replaced number is 1.


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