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Alexxandr [17]
3 years ago
14

She spent 1/4 of her money on a shirt and 2/5 on shoes. What fraction of money has been spent

Mathematics
1 answer:
likoan [24]3 years ago
4 0
1/4 = 5/20
2/5 = 8/20

8/20 + 5/20 = 13/20 has been spent
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A construction zone on Interstate 15 has a speed limit of 40 mph. The speeds of vehicles passing through this construction zone
monitta

Answer:

a. The percentage of vehicles who pass through this construction zone who are exceeding the posted speed limit =90.82%

b. Percentage of vehicles travel through this construction zone with speeds between 50 mph and 55 mph= 2.28%

Step-by-step explanation:

We have to find

a) P(X>40)= 1- P(x=40)

Using the z statistic

Here

x= 40 mph

u= 44mph

σ= 3 mph

z=(40-44)/3=-1.33

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a) P(X>40)=

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b) P(50<X<55)

Now

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z2 = (55-44)/3= 3.67

Area for z>3.59 is almost equal to 1

From the z- table we get

P(55 < X < 60) = P((50-44)/3 < z < (55-44)/3)

     = P(2 < z < 3.67)

     = P(z<3.67) - P(z<2)

     = 1 - 0.9772

     = 0.0228

or 2.28%

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3 years ago
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Step-by-step explanation:

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