How to compute for grade average

Multiply each grade by the credits or weight attached to it. ...

Add all of the weighted grades (or just the grades if there is no weighting) together.

Divide the sum by the number of grades you added together.

Check your result with the college GPA calculator.

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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