First slide

Introduction to statistics

Question

A student obtain75 %,80% and 85% in three subjects. If the marks of another subject is added, then his average cannot be less than

Easy

A

60%
B

65%
C

80%
D

90%

Solution

Marks obtained from three subjects out of 300 is 75 + 80 + 85 = 240
If the marks of another subject is added, then the marks will be $\geq$ 240 out of 400.
$∴ Minimum average marks = \frac{240}{4} = 60 %$
[When marks in the fourth subject = 0]

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