Study the table and answer the question that follows. (High = highest marks and Ave. = average marks)

Year	English		Math		Science		Social Science
	High.	Ave.	High.	Ave.	High.	Ave.	High.	Ave.
2018	80	70	94	60	89	70	65	55
2019	82	65	85	62	95	64	66	58
2020	71	56	92	68	97	68	68	48
2021	75	52	91	64	92	75	77	58

What is the overall average of the marks in all four subjects in the year 2020 considering that equal number of students appeared for all these exams?

Correct option is B

Given:

The highest and average marks for various years

Formula Used:

​$$Average = \frac{Sum \ of \ observations}{Number\ of \ observations}$$​​

Solution:

If equal number of students appeared in all four subjects then

Average of averages can be calculated directly

Here sum of averages = 56 + 68 + 68 +48 = 240

Average =$$\frac{240}{4} =60$$​​