half life is defined as the amount of time, often in years, that it takes for a radioactive substance to decrease its radioactivity by 50%. if a substance has a half-life of 43 years (f) and starts with 300 grams radioactive, then how much remains radioactive after 83 years? round to the nearest tenth of a gram.

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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