A student gets the following percentages in an examination English = 50%, Biology = 40%, Mathematics = 60%, Physics = 70%, Chemistry = 80% It was suggested that he has been given double weightage on his marks in Physics and Chemistry than in other subjects. What is the arithmetic weightage mean of marks ?

Foundation

Mathematics Foundation

Measure of Central Tendency

9th basic statistics

Data Handling

Question

A student gets the following percentages in an examination English = 50%, Biology = 40%, Mathematics = 60%, Physics = 70%, Chemistry = 80%
It was suggested that he has been given double weightage on his marks in Physics and Chemistry than in other subjects. What is the arithmetic weightage mean of marks ?

64.25

None of these

59.4

57.4

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	Marks (xi)	Weigjtage (w)	xiw
English	50	1	50
Bology	40	1	40
Mathematics	60	1	60
Physics	70	2	140
Chemistry	80	2	160
	∑w = 7		∑xw = 450

The airthmetic weightage mean of marks

$= \frac{Σxw}{Σw} = \frac{450}{7} = 64 .25$