The A.M of the following distribution is 47. Determine the value of P

Classes 0-20 20-40 40-60 60-80 80-100
Frequency 8 15 20 P 5
 
What does A.M mean? dont calculate the answer just tell me the meaning of A.M

arithmetic mean is the mean of the data, which is calculated be

where f is the frequency of the interval and x is the mid-point of the interval.

CIx (mid-point of CI) f fx
0-20108180
20-403015450
40-6050201000
60-8070p70p
80-100905450
  p+48

given: arithmetic mean = 47.

therefore

thus the value of p is 94.60.

hope this helps you.

cheers!!

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