Question

mean of the frequency distribution table is 18.....plz help out....anyone there...​

Answer 1

Answer:

Dear student here is your answer-

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Answer 2

Answer:  Step-by-step explanation:  x      Frequency(f)   xf  13            8             104 15            2             30 17            3              51 19            4              76 20+p      5p           100p+5p2 23           6              141 Total     23+5p    402+100p+5p2   Given : Mean = 18  Mean = (Total xf)/(Total f)  18  =  (402+100p+5p2) / (23+5p) 18 (23+5p) = 402 + 100p + 5p2 414 + 90p = 402 + 100p + 5p2 414 - 402 = 5p2 + 100p - 90p 12 = 5p2 + 10p 12 = 5(p2+2p) 12/5 = p2 + 2p   On solving for roots of p, p = √(17/5) - 1