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2 years ago

Tamara attends a cycling class that starts at 6:00. The class lasts 45 minutes. What time does class end?

Mathematics

1 answer:

KonstantinChe [14]2 years ago

3 0

Answer: C. 45 minutes before 7:00

Hope this helps! :)

Brainliest please.

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Nezavi [6.7K]

Exclusive events, for OR we can add probabilities.

P(O or B) = 0.49 + 0.20 = 0.69

Answer 0.69

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3 years ago

What is the following coordinates of (2,0) and (0,4)

34kurt

Answer:

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3 years ago

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4 years ago

A market surveyor wishes to know how many energy drinks teenagers drink each week. They want to construct a 80% confidence inter

jasenka [17]

Answer:

The 80% confidence interval for the mean

(4.6199 , 4.7801)

Step-by-step explanation:

Explanation:-

Assuming that the population standard deviation for the number of energy drinks consumed each week is 1

Given the Population standard deviation 'σ' = 1

The study found that for a sample of 256 teenagers the mean number of energy drinks consumed per week is 4.7

given sample size 'n' = 256

mean of the sample 'x⁻' = 4.7

confidence interval for the mean

The 80% confidence interval for the mean is determined by

$(x^{-} -Z_{\alpha } \frac{S.D}{\sqrt{n} } , x^{-} + Z_{\alpha }\frac{S.D}{\sqrt{n} } )$

the z-score of 80% level of significance = 1.282

$(4.7 - 1.282\frac{1}{\sqrt{256} } , 4.7 + 1.282\frac{1}{\sqrt{256} } )$

(4.7 - 0.0801 , 4.7 +0.0801)

(4.6199 , 4.7801)

Conclusion:-

The 80% confidence interval for the mean

(4.6199 , 4.7801)

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