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Marta_Voda [28]

2 years ago

11

Michaela pays her cell phone service provider $49.95 per month for 500 minutes. any additional minutes used cost $0.15 each. in

June her phone bill is $61.20. how many additional minutes did she use?

2 answers:

lilavasa [31]2 years ago

7 0

75 extra minutes because $61.20-$49.95=$11.25 and $11.25/$0.15=75.

Firlakuza [10]2 years ago

4 0

It's 75 additional minutes,Hope It helps! :3

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Yuki888 [10]

Answer:

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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:

$\mu = 45, \sigma = 5$

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Within one hour, which is 60 minutes. So this is the pvalue of Z when X = 60.

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

$Z = \frac{60 - 45}{5}$

$Z = 3$

$Z = 3$ has a pvalue of 0.9987

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Answer:

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So, the equation representing the cost if Lucy stays 'x' hours is,

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