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The blood group of 30 students of a class were recorded as under: If a student of this class is chosen at random, the probability that the chosen students have blood group O is:

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415

715

815

215

answer is D.

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Detailed Solution

Given the blood group of 30 students of a class was recorded.
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Number of students having blood group O = 4
And, total number of outcome = 30
The probability of an event =

\frac{Number of favorable outcomes}{Total number of outcomes}

Now, the probability that the chosen students have blood group O is,

= Number of students having blood group O Total number of outcomes = 430

= 215

The probability is

215

.
Option 4 is correct.

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