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Question

The attendance report of a class for 150 days is as follows:

StudentAttendance114621423147414951466145714781469145101501114312145131441414215148

What is the probability that a student has 98% or more attendance?


A

12

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B

13

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C

14

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D

15

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Solution

The correct option is B

13


98 percentage of 150 =98100×150=147

We know, for an event E
P(E)=Number of trials in which the event happenedTotal number of trials

Here, the event is a student having an attendance of 98% or more.
From the given table, we see that students 3, 4, 7, 10 and 15 have an attendance of 98% or more.
Hence,
Number of students having an attendance of 98% or more = 5
Total number of students = 15
Required probability=515=13


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