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Vilka [71]
3 years ago
9

The equation y= -5.131x^2 +31.821x -3.333 approximates the number of people standing in line to catch a commuter train x hours a

fter 5 a.m.
What is the best estimate for the number of people in line at 8 a.m?
A. 77
B. 46
C. 40
D. 32
Mathematics
2 answers:
Misha Larkins [42]3 years ago
7 0

Answer:

The answer is 42!!! I just took test.


Step-by-step explanation:


IRINA_888 [86]3 years ago
5 0
<span>B. 46 Replacing x with 3 (= 8-5) gives -5.131*3^2 +31.821*3 -3.333 = 45,951</span>
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Probability that the sample average is between 2.65 and 3.00 = 0.4803

Step-by-step explanation:

We are given that the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.65 and standard deviation 0.85.

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Let X bar = Sample average sediment density

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(a) Probability that the sample average sediment density is at most 3.00 is given by = P( X bar <= 3.00)

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(b) Probability that sample average sediment density is between 2.65 and 3.00 is given by = P(2.65 < X bar < 3.00) = P(X bar < 3) - P(X bar <= 2.65)

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Therefore, P(2.65 < X bar < 3)  = 0.98030 - 0.5 = 0.4803 .

                                                                             

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