Sale amounts during lunch hour at a local subway are normally ditributed, with a mean $6.28, and a standard deviation of $ 1.23. [Round your answers to two decimal places.] a. Find the probability that a randomly selected sale was at least $ 10.21? b. A particular sale was $ 8.86. What is the percentile rank for this sale amount? c. Give the sale amount that is the cutoff for the highest 23 %? d.What is the probability that a randomly selected sale is between $4.00 and $7.00?

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