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Agata [3.3K]
3 years ago
7

When is a protractor preferred to a ruler when finding a measurement

Mathematics
1 answer:
Keith_Richards [23]3 years ago
7 0
When measuring an angle.
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Suppose it is known that the distribution of purchase amounts by customers entering a popular retail store is approximately norm
Ket [755]

Answer:

69.15% probability that a randomly selected customer spends less than $105 at this store

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 = 100, \sigma = 10

What is the probability that a randomly selected customer spends less than $105 at this store?

This is the pvalue of Z when X = 105. So

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

Z = \frac{105 - 100}{10}

Z = 0.5

Z = 0.5 has a pvalue of 0.6915

69.15% probability that a randomly selected customer spends less than $105 at this store

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3 years ago
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What is half of 11 5/8 inches
disa [49]
5/8 is 0.625 add 11 it becomes 11.625  multiply it by 0.5 it becomes 5.8125 
in fraction form 11 65/72
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What is a 4 digit number divisible by 8 & 9
Serhud [2]
9000 is a 4 digit number that is divisible by 9 and 8. ( 9000/9 = 1000) and ( 9000/8 = 1125 )
4 0
3 years ago
I don't think i've been so confused ever, how do I solve this using long division?
tankabanditka [31]

Check the picture below.

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comparison: Sara has three times as many pencil erasers as Sam together they have 28 erasers how many erasers does Sara have
IgorC [24]
Sara has 21
Sam has 7
7x3= 21+ sams 7= 28
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