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blagie [28]
3 years ago
15

Ryan bought an iPhone and some cases for

Mathematics
2 answers:
kari74 [83]3 years ago
7 0

Answer:

5

Step-by-step explanation:

1245-850=395, 395/79=5

tiny-mole [99]3 years ago
4 0

Answer:

5 cases

Step-by-step explanation:

To find the case amount we must take the iphone out of the equation like this

1245-850 = 395

This leaves us with $395 and if each case costs $79 we must divide like this

395 / 79 = 5

Which leaves us with 5, so that must mean that Ryan bought 5 cases.

Hope this helps ( :

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A normal distribution has a standard deviation equal to 39. What is the mean of this normal distribution if the probability of s
Naily [24]

Answer:

The mean is \mu = 131

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.

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\sigma = 39

What is the mean of this normal distribution if the probability of scoring above x = 209 is 0.0228?

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