If the average of 31, x, 42, 39, 56, 78, 83 and 91 is 58.5, then what is the value of x?

 

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

Average of the marks of 132 students of a college is 40. If the average of the marks of the passed students is 42 and the average of the marks of the failed students is 20, then what will be the respective ratio of the total marks of passed students and the total marks of failed students?

The average marks obtained by a group of 16 students was 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.5. What was the average marks obtained by the student who left and the one who joined?

The mean of the data 1, 1/2, 1/2, 3/4, 1/4, 2, 1/2, 1/4, 3/4 is

What will be the average of the first 7 positive odd numbers divisible by 5?

What will be the average of all the prime numbers before 19?

The mean of 10 observations is 13. Two more observations are included and the new mean becomes 14. The mean of two new observations is

What is the average of 90, 250, 240, 204, and 616?