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kherson [118]
3 years ago
5

The mean of a set of normally distributed data is 600 with a standard devastation of 20. What percent of data is between 580 and

620
Mathematics
1 answer:
yuradex [85]3 years ago
3 0

Answer: 68%

Step-by-step explanation:

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1/3 part of 120 hours....

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For questions 5 and 6, solve the system using the Elimination method.
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Answer:

\boxed{x = 7~~and~~y = -3}

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Step-by-step explanation:

5x + 3y = 26 (times 6) 30x + 18y = 156

6x + 7y = 21 (times 5) 30x + 35y = 105

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30x + 18y = 156

<u>30x + 35y = 105 </u>  <u>  </u>

-17y = 51

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Substitute the value of y to one of equations

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Read 2 more answers
The diameters of ball bearings are distributed normally. The mean diameter is 106 millimeters and the standard deviation is 4 mi
Assoli18 [71]

Answer:

Probability that the diameter of a selected bearing is greater than 111 millimeters is 0.1056.

Step-by-step explanation:

We are given that the diameters of ball bearings are distributed normally. The mean diameter is 106 millimeters and the standard deviation is 4 millimeters.

<em>Firstly, Let X = diameters of ball bearings</em>

The z score probability distribution for is given by;

          Z = \frac{ X - \mu}{\sigma} ~ N(0,1)

where, \mu = mean diameter = 106 millimeters

            \sigma = standard deviation = 4 millimeter

Probability that the diameter of a selected bearing is greater than 111 millimeters is given by = P(X > 111 millimeters)

    P(X > 111) = P( \frac{ X - \mu}{\sigma} > \frac{111-106}{4} ) = P(Z > 1.25) = 1 - P(Z \leq 1.25)

                                                  = 1 - 0.89435 = 0.1056

Therefore, probability that the diameter of a selected bearing is greater than 111 millimeters is 0.1056.

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2 years ago
the time t required to cut the grass in a park varies inversely as the number of workers cutting the grass w. If 6 workers can c
mafiozo [28]
24 = 3w
w = 8 workers
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