find the value of a if the mean of the following data is40.4
variable 10 20 30 40 50 60 70
frequency 3 8 12 5 a 7 5
Answers
Answered by
1
Answer:
mean = sum/n
40.4 =3+8+12+5+7+5+a/7
=40+a/7
40.4 ×7=40+a
282.8-40=a
a=242.8
Similar questions