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# In Q.1, Exercise 14.2, you were asked to prepare a frequency distribution table regarding the blood groups of 30 students of a class. Use this table to determine the probability that a student of this class, selected at random, has blood group $ \mathrm{AB} $.

Given:

The blood groups of 30 students of class VIII are recorded as follows

A, B, 0, 0, AB, 0, A, 0, B, A, 0, B, A, 0, 0, A, AB, 0, A, A, 0, 0, AB, B, A, B, 0

To do:

We have to find the probability that a student of this class, selected at random, has blood group $AB$.

Solution:

The frequency distribution table of the given data is as follows:

Blood group | Frequency |

A | 9 |

B | 6 |

O | 12 |

AB | 3 |

Total | 30 |

Total number of students in class VIII $= 30$

The number of students who have blood group AB $= 3$

Therefore,

The probability that a student of this class, selected at random, has blood group AB $= \frac{3}{30}$

$= \frac{1}{10}$

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