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Katena32 [7]
3 years ago
9

Colin’s piano lesson is 45 minutes, or /4of an hour, long. If he practices 6 different songs and spends an equal amount of time

on each song, what fraction of an hour does he spend practicing each song?
Mathematics
2 answers:
Brrunno [24]3 years ago
7 0

Answer:

7.5 hours

Step-by-step explanation:

aleksley [76]3 years ago
5 0

Answer:  hour

Step-by-step explanation:

Given: The total time Collin spent on 6 songs =

Now, the fraction of an hour does he spend practicing each song is given by :-

The fraction of an hour does he spend practicing each song=

so b. :)

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It is advertised that the average braking distance for a small car traveling at 65 miles per hour equals 120 feet. A transportat
wariber [46]

Answer:

Step-by-step explanation:

Given that :

population mean μ = 120

sample size n = 37

sample mean x = 111

standard deviation = 21

The null hypothesis and the alternative hypothesis can be computed as:

The null hypothesis:

\mathbf{ H_o: \mu = 120 }

The alternative hypothesis:

\mathbf{ H_o: \mu \neq 120 }

Since this test is two-tailed,  the value for the test statistics can be computed as:

z = \dfrac{\overline x - \mu}{\dfrac{\sigma }{\sqrt{n}}}

z = \dfrac{111 - 120}{\dfrac{21}{\sqrt{37}}}

z = \dfrac{-9}{\dfrac{21}{6.08}}

z = -2.605

z = -2.61

Since this is a two-tailed test

P-value = 2(z < -2.61)

From the z table;

P-value = 2(0.0045)

P -value = 0.009

Decision rule: To reject the null hypothesis if the p-value is lesser than the level of significance

Conclusion: We reject the null hypothesis since the p-value is lesser than the level of significance. Thus, there is sufficient evidence to conclude that the average breaking distance differs from 120 feet.

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3 years ago
40 increased by twice a number .
igor_vitrenko [27]

Answer:

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Step-by-step explanation:

n=a number

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34=2m-8. Solve the equation
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As the number of files increases, the storage space used increases
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Part B
abruzzese [7]

Answer:

The method regarding the sampling to pick 200 sales representative is to make 20 groups of 10.

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Step-by-step explanation: correct on plato:)

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