Mathematics
The average of n numbers x1, x2, x3 ……………, xn is A. If x1 is replaced by (x + a)x1, x2 is replaced by (x + a)x2 and so on. Find the new average.
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The mean of x, x + 2, x + 4, x + 6 and x + 8 is 11, find the mean of the first three observations.
Find the mean and median of all the positive factors of 72.
The mean weight of 60 students in a class is 40 kg. The mean weight of boys is 50 kg while that of girls is 30 kg. Find the number of boys and girls in the class.
The heights (in cm) of the volley-ball players from team A and team B were recorded as :
Team A : 180, 178, 176, 181, 190, 175, 187
Team B : 174, 175, 190, 179, 178, 185, 177
Which team had the greater average height ? Find the median of team A and team B.