What is 221,000,000,000,000,000,000 expressed in scientific notation? a.2.21 × 1021 b.2.21e20 c.2.21e21 d.2.21e-20 e.2.21 × 10-21 f.2.21 × 10-20 g.2.21 × 1020 h.2.21e-21

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step-by-step explanation:

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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