Homework Answers
Solution :
From the given table,
=> Total number of customers = 84 + 68 + 64 + 57 + 89 + 91 = 453
==> P(at least 20 but no oler than 60) =
= number of customer is at least 20 but no oler than 60/Total number of customers
= (68 + 64 + 57 + 89)/453
= 278/453
= 0.6137
==> P(either older than 60 or younger than 30) = [number of older than 60 + number of younger than 30 - number of older than 60 and younger than 30]/Total number of customers
= [91 + 68 + 84 - 0]/453
= 243/453
= 0.5364
==> P(at least 50) = number of customer is at least 50/Total number of customers
= (89 + 91)/453
= 0.3974
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