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In problems # 21 to# 22 use the following Frequency table : Test score TO 41- 50 2 51 - 60 61- 70 71-80 14

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In problems # 21 to# 22 use the following Frequency table : Test score TO 41- 50 2 51 - 60 61- 70 71-80 14 2 25 81- 90 10 91- 100. 6 21. The variance, mean and standard deviation of this sample of Test scores are respectively : (a ) 51.96, 72-58, 156.21 (b ) 120. 81, 93. 60, 53.68 (c ). 13.55, 76.50, 183.60 (d ) 183-60, 76.50, 13.55

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