Question: 20. The table relates the response to a found-raising appeal by a college to its alumni to the number of years since graduation Years since

20. The table relates the response to a found-raising appeal by a college to its alumni to the number of years since graduation Years since graduationResponse 0-5 6-20 21-35 over 35Positive 120 440 210 90None 1380 3560 32 90 910

an alumni is selected at random adjoin the Row and column to the table and the expanded to find the probability of each of the following events

a. The alumnus responded .

b- the alumnus didnt respond .

c- the alumnus graduated at least 21 years ago .

d- the alumnus graduated at least 21 years ago and responded .

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