If the mean of 4 , 8 , 9 , 11 , P and 15 is 9 . Find the value of P .
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Answer:
P = 7.
Explanation:
As we know,
Mean = sum of all observation/ no. of observation.
9 = 4+8+9+11+P+15/6
=> 54 = 47+P
=> P = 7
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