Mathematics
There are 50 students in a class of which 40 are boys and the rest girls. The average weight of the students in the class is 44 kg and the average weight of the girls is 40 kg. Find the average weight of boys.
Related Questions
The mean of 20 numbers is 18. If 3 is added to each of the first ten numbers, find the mean of new set of 20 numbers.
The average height of 30 students is 150 cm. It was detected later that one value of 165 cm was wrongly copied as 135 cm for the computation of mean. Find the correct mean.
The heights of 50 children were measured (correct to the nearest cm) giving the following results :
Height (in cm) No. of children 65 1 66 4 67 5 68 7 69 11 70 10 71 6 72 4 73 2 Calculate the mean height for this distribution correct to one place of decimal.
Find the value of p, if the mean of the following distribution is 18.
Variate (x) Frequency (f) 13 8 15 2 17 3 19 4 20 + p 5p 23 6