The mean and standard deviation of marks obtained by 40 students of a class in statistics are
55 and 8 respectively. If there are only 5 girls in the class and their respective marks are 40,
55, 63, 75 and 87, find mean and standard deviation of the marks obtained ?
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mgd€-/(€#/₩£₩%£$)_#€/_#£=£#/£)%£_@£_×4₹6/€=/€$€₹=846×9=75£=₩6
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