justin picked out 300 dollars worth of clothing at mary’s department store. as part of a promotion, he will flip a fair coin at the cash register. if the coin lands on heads, he will get 40% off of his entire purchase. if the coin lands of tails, he will have to pay the regular price. find the expected cost of justin’s shopping spree
Answers
Given : justin picked out 300 dollars worth of clothing at mary’s department store. He will flip a fair coin . if the coin lands on heads, he will get 40% off of his entire purchase. if the coin lands of tails, he will have to pay the regular price.
To find : the expected cost of justin’s shopping spree
Solution:
Regular Cost of Shopping = 300 $
40% off = (40/100)300 = 120$
Price after 40% off = 300 - 120 = 180 $
Fair coin
hence P(Head ) = P(Tail ) = 1/2
P(x) x ( amount to pay) x.P(x)
Tail (1/2) 300 150
Head (1/2) 180 90
∑ x. P(x) = 150 + 90 = 240
Expected cost of justin’s shopping spree = 240$
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Answer:
Expected cost of justin’s shopping spree = 240$
Step-by-step explanation: