Find P if mean=20
xi fi
15 2 17 3
19 4
20+P 5P
23 6
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Step-by-step explanation:
Given Find P if mean = 20 xi fi 15 2 17 3 19 4 20+P 5P 23 6
- So xi fi xifi
- 15 2 30
- 17 3 51
- 19 4 76
- 20 + p 5 p 100 p + 5p^2
- 23 6 138
- So ∑ fi = 15 + 5 p ∑ fixi = 295 + 100p + 5p^2
- We know that Mean = ∑ fixi / ∑ fi
- 20 = 295 + 100 p + 5p^2 / 15 + 5p
- So 300 + 100 p = 295 + 100 p + 5p^2
- So 300 – 295 = 5 p^2
- Or 5p^2 = 5
- So p^2 = 1
Or p = 1 since frequency is positive.
Reference link will be
https://brainly.in/question/1132278
https://brainly.in/question/6480143
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