Find the mean of the following distribution: x:           4                 6                 9               10               15 f:            5                 10               10               7                 8

Explanation

Added: `x_i=4,6,9,10,15`
`f_i=5,10,10,7,8`
Mean`=(sumx_i\f_i)/(sumf_i)`
Mean`=((4xx5)+(6xx10)+(9xx10)+(10xx7)+(15xx8))/(5+10+10+7+8)`
Mean`=360/40`
Mean`=9`
Hence, the mean is `9`.