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Alekssandra [29.7K]
2 years ago
7

Over the past 20 years, the average annual return for shortstop baseball gear has been 9% and the standard deviation has been 4%

. given this information you know that the:
Mathematics
1 answer:
Inessa05 [86]2 years ago
3 0
From the given statement above, the information that can be extracted from the data is the mean which is equal to 9 % , SD equal to 4%, n is equal to 20. we can also get the variance from SD. also, we can also determine the z-score of the data which is important in the distribution.
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Jackie and Rachel both worked during last summer and made $960 each. Rachel worked 16 hours more than Jackie, but Rachel earned
Pavel [41]

Answer:

The number of hours Jackie worked  = 80hours

Step-by-step explanation:

Last summer:

Jackie made $960

Rachel made $960

let number of hours Jackie worked = x

Rachel worked 16 hours more than Jackie:

Number of hours Rachel worked = x + 16

if Jackie earned $y  per hour

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960 = 960 - 2x +16y -32

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2x -16y = -32

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x = 8y-16

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(8y-16)y = 960

8y² -16y = 960

y² -2y - 120 = 0

y²+10y-12y -120 = 0

y(y+10) -12(y+10) = 0

(y-12) = 0 or (y+10) = 0

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x = 8(12) -16 = 80

The number of hours Jackie worked = x = 80 hours

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