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Dominik [7]
2 years ago
12

Today I spent 90 minutes playing sports. Sixty percent of the time I was playing tennis. For how many minutes did I play tennis?

Mathematics
2 answers:
jeyben [28]2 years ago
6 0

Answer:

54min

Step-by-step explanation:

Darina [25.2K]2 years ago
5 0
The answer is 54 minutes because 60% of 90 is 54
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A simple random sample of 50 items from a population with 7 resulted in a sample mean of 35.
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<h3>What is Probability ?</h3>

Probability is the study of likeliness of an event to happen.

It is given that

Total Population = 50

Mean = 35

The confidence interval is given by

\rm CI = \mu + z \dfrac{s}{\sqrt n}

\rm \mu is the mean

z is the confidence level value

s is the standard deviation

n is the population width

(a) The 90% confidence interval for the population mean

90% \rm \alpha / 2  = 0.05

Z = 1.64

34 \rm \pm 1.64 * 8 / √50

34 \rm \pm  1.855

32.145 < \rm \mu < 35.855

(b)  The 99% confidence interval for the population mean

99% \rm \alpha / 2  = 0.005

Z=2.57

34  \rm \pm 2.57 * 8 / √50

34 \rm \pm  2.907

31.093 <  \rm \mu < 36.907

Therefore the confidence interval for population mean has been determined.

The complete question is

A simple random sample of 50 items from a population width =7  resulted in a sample mean of 35. If required, round your answers to two decimal places.

a. Provide a 90% confidence interval for the population mean

b. Provide a 99% confidence interval for the population mean

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Step-by-step explanation:

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Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!

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