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| 1. |
if mean of the following data is 14.7and total frequency is 40.find the value p and q |
| Answer» class freq total0-6 10 3 * 106-12 p 9 * p12-18 4 4 * 1518-24 7 7 * 2124-30 q 27 * q30-36 4 4 * 3336-42 1 1 * 39=====================total 40 408 + 9p + 27 q============================total of frequencies = 26 + p + q = 40 => p+q = 14sum = 408 + 9 p + 27 q = 14.7 * 40 = 588So finally, 9 p + 27 q = 180 => p + 3 q = 20 => 14- q + 3 q = 20 =>\xa0\xa0q = 3 and p = 11 . | |