inter -IIA Maths|| 8.Measures Of Dispersion || mean,variance,standard deviation | Ap & Ts 7M imp Que

inter -IIA Maths
8.Measures Of Dispersion mean,variance,standard deviation Ap & Ts 7Marks important Question
1.calculate the variance and standard deviation of the following continous frequency distributions
Class Interval Frequency
30-40. 3
40-50. 7
50-60. 12
60-70. 15
70-80. 8
80-90. 3
90-100. 2
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