CBSE Class 9 Answered
The mean of the following distribution is 50.
xi
10
30
50
70
90
yi
17
5p + 3
32
7p - 11
19
Find the value of p.
Asked by Topperlearning User | 09 Dec, 2013, 10:33: AM
Expert Answer
xi |
fi |
fixi |
10 |
17 |
170 |
30 |
5p + 3 |
30(5p + 3) |
50 |
32 |
1600 |
70 |
7p - 11 |
70 (7p - 11) |
90 |
19 |
1710 |
Mean =
50(60 + 12p) = 2800 + 640p
3000 - 2800 = 640p - 600p
200 = 40p
Hence, p = 5
Answered by | 09 Dec, 2013, 12:33: PM
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