Give two reasons why you think that three to five days seem to be popular lengths of engineering conferences. (Select all that apply.) 50% of the data values range from 3 to 5 days. The mean, median, and mode are within this range. Engineering is boring, so people do not want to spend many days at a conference. A conference that lasts 9 days is not effective.

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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