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If the Mean of the Following Data is 15, Find P. X: 5 10 15 20 25 F : 6 P 6 10 5 - Mathematics

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प्रश्न

If the mean of the following data is 15, find p.

x: 5 10 15 20 25
f : 6 p 6 10 5
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उत्तर

x f fx
5 6 30
10 p 10p
15 6 90
20 10 200
25 5 125
  N = P + 27 `sumfx = 10p +445`

Given mean = 15

⇒`(sumxf)/N = 15`

⇒`(10p + 445 )/ (p+ 27) = 15`

⇒ 10p +445 = 15p +405

⇒ 15p - 10p = 445 - 405

⇒ 5p = 40

⇒ `p = 40 /5`

∴ p = 8

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पाठ 24: Measures of Central Tendency - Exercise 24.2 [पृष्ठ १५]

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आरडी शर्मा Mathematics [English] Class 9
पाठ 24 Measures of Central Tendency
Exercise 24.2 | Q 6 | पृष्ठ १५
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