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CBSE Class 9 Answered

Find p if mean is 40.4 and xi 10  20   30  40   50   60  70  and fi  3  8  12  5   p  7  5
Asked by nisha_vini29 | 31 Jan, 2018, 01:12: AM
answered-by-expert Expert Answer
begin mathsize 16px style straight x subscript straight i space space space space colon space space 10 space space space space 20 space space space space space 30 space space space space space space space 40 space space space space space 50 space space space space space space space 60 space space space space space 70
straight f subscript straight i space space space space colon space space space 3 space space space space space space space 8 space space space space space space 12 space space space space space space space 5 space space space space space space space space straight p space space space space space space space space space 7 space space space space space space space 5
straight f subscript straight i xi space colon space space space 30 space space space 160 space space space 360 space space space space space 200 space space space space 50 straight p space space space space 420 space space space space space 350

Now comma
Σfi equals 40 plus straight p equals straight N
Σfixi equals 1520 plus 50 straight p

Mean equals 40.4
Mean equals Σfixi over straight N
rightwards double arrow 40.4 equals fraction numerator 1520 plus 50 straight p over denominator 40 plus straight p end fraction
rightwards double arrow 1616 plus 40.4 straight p equals 1520 plus 50 straight p
rightwards double arrow 9.6 straight p equals 96
rightwards double arrow straight p equals 10 end style
Answered by Rashmi Khot | 31 Jan, 2018, 08:58: AM
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