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Vsevolod [243]
2 years ago
9

The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in t

he sample to check out was 3.1 minutes with a standard deviation of 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes. The p-value is
Mathematics
1 answer:
masha68 [24]2 years ago
8 0
The answer is: 0.0228
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2.25*x=10
Which x is the number of books purchased

Solve for x
X=10÷2.25
X=4.44
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Lapatulllka [165]

Answer:

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32^{- \frac{2}{5} }  =  ( \frac{1}{32}) ^{ \frac{2}{5} } = ( \frac{1}{32} )^{ \frac{1}{5} *2}  =  [ ( \frac{1}{32}) ^{ \frac{1}{5} } ]^{2}  =  ( \sqrt[5]{ \frac{1}{32} } ) ^{2}  =  ( \sqrt[5]{ \frac{1}{2}*  \frac{1}{2} *  \frac{1}{2} *  \frac{1}{2} *  \frac{1}{2}   } )^{2} = ( \frac{1}{2} )^{2}   answer 

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3 0
2 years ago
Mr. Williams is painting only the back of his barn. A gallon of paint covers 70 square feet. How many square feet will Mr. Willi
Alex17521 [72]

Answer:

Option A. 264 ft² ; 4 gallons

Step-by-step explanation:

Given question is incomplete; find the complete question in the attachment.

From the picture attached,

Area of the barn to be painted = Area of the (rectangular base + Triangular top) - Area of the window

Area of the rectangular base = 12 × 18

                                                = 216 ft²

Area of the triangular top = \frac{1}{2}(\text{Base}\times \text{Height})

                                          = \frac{1}{2}(12)(28-18)

                                          = 60 square feet

Area of the window = 3 ft × 4 ft

                                 = 12 ft²

Total area to be painted = 216 + 60 - 12

                                         = 264 ft²

∵ 70 square feet of the barn is covered by the amount of paint = 1 gallon

∴ 1 square feet will be covered by the amount = \frac{1}{70} gallons

∴ 264 square feet will be painted by = \frac{264}{70}

                                                             = 3.77 gallons

                                                             ≈ 4 gallons

Therefore, Option (A). 264 ft²; 4 gallons will be the answer.

3 0
3 years ago
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A student wants to prove that she can solve a system of a system of equations by replacing one of the equations with two times t
serg [7]

Answer: y=+{%

Step-by-step explanation:

€

hey

heh

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