Number 100 50 Mean weight 60 kg 45 kg Variance 9 kg2 4 kg2 Find arithmetic mean and standard deviation of the boys and girls taken together. Ans, 55, 7.572 Q.37A calculating machine while calculating...

Please solve Q(38)

Extracted text: Number 100 50 Mean weight 60 kg 45 kg Variance 9 kg2 4 kg2 Find arithmetic mean and standard deviation of the boys and girls taken together. Ans, 55, 7.572 Q.37A calculating machine while calculating mean and standard deviation of 25 readings misread one observation as 36 instead of 26. The following results were given by the machine. S.D. 5 and X = 30. What are the correct values of %3D %3| X and S.D.? Ans, 29.6, 4.9 Q.38A group has arithmetic mean of 10 from 60 items with variance 4. A subgroup of 40 items has mean 11 and standard deviation 1.5. Find the mean and standard deviation of other subgroup. Ans. 8, 1.225 Q 39 The mean of 5 observations is 4.8 and variance is 4.56. If three of the five observations are 2, 5 and 6, find the other two observations. two observatio andY Ans. 8 and 3. 9.40 Calculate the first four moments about the mean for the observations 81, 87, 90, 93, 94, 95, 98, 104, 105. Ans. 0. 52.54, – 40:56, 6249.26