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denpristay [2]
3 years ago
5

a shopkeeper buys coffee at 4.20 per kg and sells it at 63 cents per 100 g Calculate his profit percentage

Mathematics
1 answer:
Bingel [31]3 years ago
7 0
420 cents for 1000 g. So 42 cents for 100 g (i crossed multiplied). %profit=63-42/42 *100=50%
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Henry and reiko both used 1 yard of ribbon to make bows. write two different fractions to show that Henry and reiko use the same
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A bike originally costs $529.99 and is on sale for $317.99. What was the amount discounted?
alexgriva [62]
The answer is: $212.
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List the fractions and decimals in order from least to greatest: -0.6,-5/8,-7/17,-0.72
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(This will make it much easier to compare.)

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guapka [62]

See https://web2.0calc.com/questions/help_29603.

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An engineer commutes daily from her suburban home to her midtown office. The average time for a one-way trip is 36 minutes, with
Ivanshal [37]

Answer:

57.93% probability that a trip will take at least 35 minutes.

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 = 36, \sigma = 4.9

What is the probability that a trip will take at least 35 minutes

This probability is 1 subtracted by the pvalue of Z when X = 35. So

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

Z = \frac{35 - 36}{4.9}

Z = -0.2

Z = -0.2 has a pvalue of 0.4207

1 - 0.4207 = 0.5793

57.93% probability that a trip will take at least 35 minutes.

3 0
3 years ago
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