Question

The marks of 15 students in an exam out of 10 marks is as follows: 3,9,7,5,6,3,7,6,7,4,7,7,4,8,2 Find the mean mode and median

Answer 1

The mode is 7
the median is 6

Answer 2

arrange in increasing order = 2,3,3,4,4,5,6,6,7,7,7,7,7,8,9.
mode = 7 (7 comes more times)
median = 6 
by empirical formula, 3 median = 2 mean + mode
                                         3 x 6 = 2 mean + 7
                                       18 - 7 = 2 mean
                                       mean = 5.5