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tiny-mole [99]
3 years ago
5

Pvc pipe is manufactured with a mean diameter of 1.01 inch and a standard deviation of 0.003 inch. find the probability that a r

andom sample of n = 9 sections of pipe will have a sample mean diameter greater than 1.009 inch and less than 1.012 inch

Mathematics
2 answers:
Tema [17]3 years ago
5 0
The probability that the sample mean is within 2 standard deviations on the high side and 1 standard deviation on the low side is about 0.8186.

Elodia [21]3 years ago
4 0

Answer:   7.517 inches

Hope I was helpful! (:

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3 years ago
Bethany has 3.10$ in nickels and dimes. She has a total of 44 coins . What is the value of the nickels Bethany has
vlada-n [284]
Represent the unknows with n and d.

Then n+d = 44 (# of coins)

and 

$0.05n + $0.10d = $3.10   (value of coins)

Solving the first equation for n, we get n = 44-d.  Subst.  44-d for n in the 2nd equation:

0.05(44-d) + 0.10d = 3.10
Then 2.20 - 0.05d + 0.10d = 3.10, or
          2.20 + 0.05d             = 3.10, or    0.05d = 0.90.  Solving for d, 
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d = -------- = 18
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There are 18 dimes and 44-18 nickels.  How many nickels is that?  ;)

5 0
3 years ago
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A model is 4.2 feet tall, the plywood used to make the model is 0.6 inch thick. How many sheets of plywood to make the model?
nadya68 [22]
Answer=84 sheets

4.2feet
1 foot=12 inches

4.2*12=<span>50.4inches

50.4/0.6=</span><span>84 sheets</span>
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sergey [27]

Answer:

-2 I think

Step-by-step explanation:

6 0
3 years ago
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