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Lyrx [107]
2 years ago
7

Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviatio

n of six minutes. A random sample of 28 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Find a 90% confidence interval estimate for the population mean delivery time.
Mathematics
1 answer:
natta225 [31]2 years ago
5 0

Answer:

90% confidence interval = (34.069,37.931)  

Step-by-step explanation:

90% 1.645

 Xbar / Point Est. 36

 µ 0

σ 6

n 28

Confidence Interval  

 (34.069,37.931)  

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Seventy concert tickets were sold for $550. each adult ticket cost $9 and each childrens ticket cost $5. find the number of adul
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Answer:

Total tickets = 70

Total cost = $550

Adult's ticket = $9

Child's ticket = $5

Difference = 9 - 5 = $4

Assume all 70 are child's tickets

5 x 70 = 350

But the total cost was 550

550 - 350 = $200

The $200 must have come from Adult's tickets, which has a difference of $4.

200 ÷ 4 = 50

So there are 50 adult's tickets.

70 - 50 = 20

And there are 20 child's tickets.

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2 years ago
URGENT!!!! The area of a rectangular floor is 80 square feet. The length of the floor is 2 feet less than the width of the floor
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Answer:

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Step-by-step explanation:

First, you have to form expressions of width and length in terms of w. With the given information :

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Given that the area of rectange is A = length × width so you have to subtitute the expressions and value into the formula :

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3 years ago
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Answer:

E

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Answer:

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Step-by-step explanation:

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