Question

please solve me this​

Answer 1

Step-by-step explanation:

Mean = Sum of Observation / Number of Observation

9 = [x + x + 3 + x + 5 + x + 7 + x + 10] / 5

9 = [5x + 25] / 5

9 = 5[x + 5] / 5

9 = x + 5

x = 4

Observation → 4, 7, 9, 11, 14

Last 3 Observation → 9, 11, 14

Mean = (9+11+14)/3

= 34/3

= 11.333

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Let x be the mean of 50 numbers.

∴ Sum of 50 numbers = 50x

According to question

Each number is subtracted from 53.

(53 × 50) - (50x) / 50 = - 3.5

2650 - 50x = -175

50x = 2825

x = 2825 / 50

x = 56.5