The abacus classes chosen by 20 students is given below. Find the probability of choosing Level-3 classes.

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Solution

Total number of students = 20

From the table, we observe:

Number of students who chose
Level-3 class = 4

$\text{Probability} = \dfrac{Number~of~favorable~outcomes}{Total~ number~of~outcomes}$

Putting the values, we get:
$\text{Probability of choosing Level-3 class}= \dfrac{4}{20}$
$~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=20\%$

Hence, the probability of choosing Level-3 class is 20%.

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