Suppose a local pizzeria delivers pizzas every day of the week and their delivery times are normally distributed with a mean of
30 minutes with a standard deviation of 4 minutes. Determine the interval that contains the middle 80% of delivery times.
1 answer:
Answer:
interval in minutes = (24.88, 35.12)
Step-by-step explanation:
we can use the following formula:
interval = population mean ± (z · σ)
- population mean = 30 minutes
- z for 80% = 1.28
- σ = 4 minutes
interval = 30 minutes ± (1.28 · 4 minutes)
interval in minutes = (30 - 5.12), (30 + 5.12) = (24.88, 35.12)
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B is the answer because 60/ 12.50 equals 12/2.5
