A museum sells different items in their gift shop. The graph shows how many of each item was sold one day.

Mathematics

2 answers:

Artemon [7]3 years ago

6 0

It’s C
15 postcards + 10 shirts =25
40 pencils - 25 shirts and postcards = 15

Nimfa-mama [501]3 years ago

5 0

It’s c I believe. I’m sorry if I’m wrong.

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Answer:

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baherus [9]

Answer:

The mean is 9.65 ohms and the standard deviation is 0.2742 ohms.

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.

10% of all resistors having a resistance exceeding 10.634 ohms

This means that when X = 10.634, Z has a pvalue of 1-0.1 = 0.9. So when X = 10.634, Z = 1.28.

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$1.28 = \frac{10.634 - \mu}{\sigma}$