If 40% of the pizzas arrive on time, then 60% of the pizzas will be late.

Change the percent to a decimal: 60% = 0.6

Four late pizzas in a row = 0.6^4 = 0.1296

a) The probability that the first four deliveries will be late is 12.96%.

b) 40% of...

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If 40% of the pizzas arrive on time, then 60% of the pizzas will be late.

Change the percent to a decimal: 60% = 0.6

Four late pizzas in a row = 0.6^4 = 0.1296

a) The probability that the first four deliveries will be late is 12.96%.

b) 40% of the pizzas arrive on time. 40% is equal to 2/5. Therefore, it is expected the first and second pizzas will be late, and the third pizza will be on time.