Calculate the mean from the following table.

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.)