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Nuetrik [128]
3 years ago
10

On the first day of school bethanys family's donated 60$

Mathematics
1 answer:
s344n2d4d5 [400]3 years ago
7 0

Answer:

6000 cents

Step-by-step explanation:

60$ is 6000 cent because you would think 100 cent is 1$ so then you would times that by 60 and a fast way to do that is to do 100 then 60 has 1 0's so add 1 0 to the end put the 1 to a 6.

Hope This Helps

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Answer:

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c) P=0.69

d) Smaller

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Step-by-step explanation:

a) When we have a sample taken out of the population, the standard error of the mean is calculated as:

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where n is te sample size (n=25) and σ is the population standard deviation (σ=10).

Then, the standard error of the classroom average score is 2.

b) The calculations for this range are the same that for the confidence interval, with the difference that we know the population mean.

The population standard deviation is know and is σ=10.

The population mean is M=80.

The sample size is N=25.

The standard error of the mean is σM=2.

The z-value for a 95% confidence interval is z=1.96.

The margin of error (MOE) can be calculated as:

MOE=z\cdot \sigma_M=1.96 \cdot 2=3.92

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The approximate probability that a classroom will have an average test score of 79 or higher is 0.69.

d) If the sample is smaller, the standard error is bigger (as the square root of the sample size is in the denominator), so the spread of the probability distribution is more. This results then in a smaller probability for any range.

e) If the population standard deviation is smaller, the standard error for the sample (the classroom) become smaller too. This means that the values are more concentrated around the mean (less spread). This results in a higher probability for every range that include the mean.

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