Given below is the marks obtained by 20 students in mathematics out of 30 marks. 7, 9, 12, 12, 13, 12, 14, 14, 14, 14, 15, 16, 17, 18, 18, 19, 20, 18, 20, 13. Then (2 × median — mode) of the data is equal to:

Show answer & explanation

Answer: (B) 14

Explanation

In order, the 10th and 11th marks are both 14, so the median is 14. 14 also occurs most often (4 times), so the mode is 14. 2 × 14 − 14 = 14.