Question

The mean of first ten prime numbers is
(a) 11.5
(b) 12.5
(c) 12.9
(d) 13.9

ncert class7 maths plz answer​

Answer 1

Answer:

12.9

Step-by-step explanation:

First ten prime numbers = 2, 3, 5, 7, 11, 13, 17, 19, 23, 29

Mean = Sum of all observations/ Number of Observation

          = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29/ 10

          = 129/10

= 1.29

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Answer 2

c) 12.9

firstly add the ten consecutive prime numbers,i.e., 2,3,5,7,11,13,17,19,23,29

which sums up to 129..

now divide it by ten(as total count of all no. is 10)

129÷10=12.9

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