The mean of 150 items was found to be 45. If at the time of calculation, two items were wrongly taken as 83 and 76 instead of 38 and 46, then the correct mean is:

The mean marks of boys in a class is 52 and that of girls is 42. The mean marks of boys and girls combined is 50. The percentage of boys in the class is:

The mean of the probability distribution of the number obtained on throwing a die having 1 on three faces, 2 on two faces, and 5 on one face is:

What is the mean of the following distribution? 

The arithmetic mean of the observations 28, 31, 40, 63, 57, 37, 34, 70 and 99 is:

​Correct relation for the numbers 10, 7, 8, 5, 6, 8, 5, 8, 6 is:​

​If mean of a variable X is M, then mean of variable Y = (X – 4)/5 will be:​

What is the mean of the following distribution?

The arithmetic mean of the observations 83, 17, 62, 87, 62, 96, 86, 92 and 90 is:

What is the mean of the following distribution?

The mode and median of a data set is 89.7 and 32, respectively. What is the mean of the data set? (Use empirical formula.)