Question

Find the mean of the observed value 15,30,20,45,35,40,72,60 and 70. If each of the value is increased by 7, then find the new mean.

Answer 1

Answer:

mean = sum of observation/number of observation

$\frac{15 + 30 + 20 + 45 + 35 + 40 + 72 + 60 + 70}{9} \\ \\ = \geqslant \frac{387}{9} = 43$

Mean of following data is 43 .

now according to your question if 7 is subtracted from each find the new mean so.

$387 - 9 \times 7 \\ \\ = \geqslant 387 - 63 \\ \\ = \geqslant 324$

Again mean = sum of oberva/no. of observat

$\frac{324}{9}$

= 36

Answer 2

Step-by-step explanation:

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