Average Questions

The sum of 15 observations of a data is (434 + x). If the mean of the data is x, then the value of x is

The standard deviation of the set {10, 10, 10, 10, 10} is

Four numbers A, B, C and D are such that their overall average is 16. The average of A and B is 9.5. The average of C and D is

The mean of the data 3, 10, 10, 4, 7, 10, 5 is

Find the average of all prime numbers from 1 to 50.

The mean score in a test of the 10 boys in a class was 15 while the overall mean of the 25 students in the class was 16.2. What was the mean score of the girls?

The median of the data -3, 4, 0, 4, -2, -5, 1, 7, 10, 5 is

There was a group of 6 students who took a test. Another student joined the group after taking the test later. With her marks included the average score of the group went up by 3. This student has got ___ marks more than the average marks without her being included.