Answer:The answer is 19
Step-by-step explanation:Mean is known as average so the total of all the number is 17 x 7 which will give us 119. As 119 is the total, we got all other six sets of numbers out of the seven so we use 119 to subtract 15,19,18,13,21 and 14 which will give us 19.
Answer:
9
Step-by-step explanation:
Let the missing observation be x
Then we get 15,19,18,x,13,21,24 observations, i.e. 7 observations
We know mean = sum of observations/total no. of observations
Here sum = 15+19+18+x+13+21+24+x = 110+x
mean = 17
Hence
Equating mean with 17
9 is the missing observation
