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andreev551 [17]
2 years ago
9

Yesterday Jefferson slept for 7 hours and 45 minutes. Katherine slept for 8 hours and 25 minutes. How much longer did Katherine

sleep than Jefferson?
Mathematics
1 answer:
xxTIMURxx [149]2 years ago
6 0
8 hours and 75 minutes later at the park and then I’ll be home Jefferson
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Sam invests £1800 in the bank for four
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Answer:

£2088

or

US$ 2,536.48 dollars (2021)

Step-by-step explanation:

4% of 1800 = 72

72 x 4 = 288

1800 + 288 = 2088

He has £2088 at the bank after 4 year

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. True or False? Write your response next to the statements below. A) Sam computed a 90% confidence interval for µ from a specif
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Answer:

A) True , B) True , C) False

Step-by-step explanation:

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2 years ago
How to calculate the are of a shape
Ira Lisetskai [31]
This can vary, some shapes have different area formulas, here are some basic formulas I can give you:
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6 0
2 years ago
A company that produces an expensive stereo component is considering offering a warranty on the component. Suppose the populatio
Llana [10]

Answer:

Warranty of 66 months.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 84, \sigma = 9

If the company wants no more than 2% of the components to wear out before they reach the warranty date, what number of months should be used for the warranty?

Only the lowest 2% will be replaced, so the warranty is the value of X when Z has a pvalue of 0.02. So it is X when Z = -2.055.

Z = \frac{X - \mu}{\sigma}

-2.055 = \frac{X - 84}{9}

X - 84 = -2.055*9

X = 65.5

Warranty of 66 months.

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