The percentage of marks obtained by a student in the monthly tests are given below :
Test $I$ $I I$ $I I I$ $I V$ $V$
Percentage marks obtained $69$ $71$ $73$ $69$ $74$
Find the probability that a student gets more than $70 %$ marks.

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Solution

Total no. of unit tests $= 5$
Number of tests in which the student scored more than $70 %$ marks $= 3$
Therefore,
Probability that a student gets more than $70 %$ marks $= \frac{No. of tests in which the student scored more than 70 % marks}{Total no. of tests} = \frac{3}{5} = 0.6$

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Similar questions

The percentage of marks obtained by a student in monthly unit tests are given below:

$\begin{matrix} unit test & I & I I & I I I & I V & V Percentage of marks obtained & 69 & 71 & 73 & 68 & 76 \end{matrix}$

Find the probability that the student gets:

(i) more than 70% marks (ii) less than 70% marks (iii) a distinction.

Unit test:	I	II	III	IV	V
Percentage of marks obtained:	69	71	73	68	76

Unit test	I	II	III	IV	V
% of marks	70	72	65	68	86

The percentages of marks obtained by a student in six unit tests are given below:

If a test is selected at random then, the probability that the student gets more than 60% marks in the test is

Unit test	I	II	III	IV	V	VI
Percentage of marks obtained	53	72	28	46	67	59

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Test	$I$	$I I$	$I I I$	$I V$	$V$
Percentage marks obtained	$69$	$71$	$73$	$69$	$74$