the mean of three number is 10.The mean of 4 number is 12 find the mean of all the numbers
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Answer:
11.14
Step-by-step explanation:
Mean of 3 no. = 10
Mean= Sum of 3 observations/3
10 = Sum of observation/3
Sum of observation= 30. eq. -----1
Mean of 4 no. = 12
Mean = Sum of 4 observations/4
12 = Sum of 4 observations /4
Sum of observations = 48. eq. ----2
On adding eq. 1 and 2 , we get:-
Sum of observation= 3+4
= 7 observations
Sum of 7 observations = 30+48
= 78
Mean = 78÷7
= 11.14 (Ans.)
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