Calculate the variance and standard deviation from the data given below: Size of item, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5 Frequency , 3, 7, 22, 60, 85, 32, 8

Explanation

`((x),(3.5),(4.5),(5.5),(6.5),(7.5),(8.5),(9.5),(ToTal))`
`((f),(3),(7),(22),(60),(85),(32),(8),(217))`
`((fx),(10.5),(31.5),(121),(390),(637.5),(272),(76),(1538.5))`
`(((x-mean)),(-3.59),(-2.59),(121),(-.59),(-0.42),(1.41),(2.41))`
`(((x-mean)^2),(12.8),(6.7),(2.5),(0.35),(0.168),(1.988),(5.80))`
`((f(x-mean)^2),(38.6),(46.9),(55.6),(20.87),(14.298),(63.632),(46.47),(286.5))`



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