Mathematics
The mean age of 33 students of a class is 13 years. If one girl leaves the class, the mean becomes years. What is the age of the girl ?
Related Questions
The mean of the numbers 6, y, 7, x, 14 is 8. Express y in terms of x.
The mean of 9 variates is 11. If eight of them are 7, 12, 9, 14, 21, 3, 8 and 15, find the 9th variate.
In a class test, the mean of marks scored by a class of 40 students was calculated as 18.2. Later on, it was detected that the marks of one student was wrongly copied as 21 instead of 29. Find the correct mean.
Find the mean of 25 given numbers when the mean of 10 of them is 13 and the mean of the remaining numbers is 18.