Question

if the mean of 10 observations is 7 and the mean of 15 observations is 12 then the mean of all the observations is

Answer 1

total observations=25
sum of total occurence=19
mean=sum of all observation÷no of observation
19÷25=0.76 Ans

Answer 2

Answer:

10

Step-by-step explanation:

the mean of 10 observations is 7

sum of observations/10=7

sum=70

the mean of 15 observations is 12

sum/15=12

sum=180

new mean = 180+70/10+15

                 =250/25

                =10