Question

7. The mean of 15 observations is 32. Find the
resulting mean, if each observation is :
(i) increased by 3 (ii) decreased by 7
Sola​

Answer 1

Answer:

Increased by 3, new mean is 35

Decreased by 7, new mean is 25

Step-by-step explanation:

Mean = 32 and no. of observation is 15

Mean = sum of observation/ no. of observation

32= sum of observation/ 15

sum of observation= 32x15= 480

In increased by 3,

Then if we increase every observation by 3, so

no. of observation is 15, then

15x3=45

Now, we will add 45 in sum of observation,

480+45=525

So, new mean is = 525/15= 35

In decreased by 7,

Then if we decrease every observation by 7, so

no. of observation is 15, then

15x7=105

Now, we will subtract 105 from sum of observation,

480 - 105=375

so, new mean is = 375/15 =25