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stira [4]
3 years ago
8

A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean

is 8.4 hours and the standard deviation is 1.8 hours. If 40 mechanics are randomly selected, find the probability that their mean rebuild time exceeds 9.1 hours.
Mathematics
1 answer:
djyliett [7]3 years ago
8 0

Answer:

The probability is 0.0069

Step-by-step explanation:

First thing to do here is to calculate the z-score

Mathematically;

z-score = (x-mean)/SD/√(n)

where x = 9.1 , mean = 8.4 , SD = 1.8 and n = 40

Plugging these values into the z-score equation, we have;

z-score = (9.1-8.4)/1.8/√(40) = 0.7/1.8/6.325 = 0.0615

Now, we check the standard normal table for P(z > 2.46) = 0.0069

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Step-by-step explanation:

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Use the given conditions to write an equation in slope-intercept form. slope = 7, passing through (1,-3) My suggestion is to fir
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Step-by-step explanation:

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5 0
4 years ago
You are going to make 5 assemblies, where each assembly requires the use of 1 Type A Bolt. You have a container of bolts that co
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Answer:

Step-by-step explanation:

You are to make 5 assemblies.

Each assembly requires the use of 1 Type A bolt.

To make the 5 assemblies, you need 5 Type A bolts.

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The focus - Type A bolts - is 20 out of this 60.

The probability of obtaining a Type A bolt at all, is 20/60, which is = 1/3

(A) What is the probability of taking the exact number of Type A bolts you need for your 5 assemblies, if you randomly take 10 bolts from the container?

- The exact number of Type A bolts you need for the 5 assemblies is 5

1/3 × 5/10 =  5/30 =  1/6 =  0.167

(B) What is the probability of taking/having less than 5 Type A bolts out of the randomly selected 10 bolts? The solution is to sum up the following:

1/3 × 4/10 = 0.133

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7 0
3 years ago
Please help I will make BRAINLIEST!!!!!
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Answer:

variable= x

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Step-by-step explanation:

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3 0
3 years ago
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Answer:

Your answer would be B.

Step-by-step explanation:

a^2 + 9^2 = 113^2

Solve exponents.

A^2 + 81 = 113

Subtract 81 from each side.

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Square root each side.

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Hope this helps & good luck!

Feel free to message me if you need more help! :)

7 0
3 years ago
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