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Radda [10]
3 years ago
5

Alfie buys two books, each at the same price. He pays with a £10 note and gets £2.30 change.

Mathematics
1 answer:
Simora [160]3 years ago
7 0
First subtract the amount he paid from the amount of change he got:

10 - 2.30 = 7.70

So the price for the two books was <span>£7.70, now divide by 2.

7.70 / 2 = 3.85

So each book cost </span><span>£3.85</span>
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For a population with = 100 and = 20, what is the x value corresponding to z = 1.50?
mafiozo [28]

For a population with mean (μ) = 100 and standard deviation (σ) = 20, the X value corresponding to z = 1.50 is 130.

<h3>What is a z-score?</h3>

A z-score is also referred to as a standard score and it's a measure of the distance between a raw score and the mean, when standard deviation units are used.

<h3>How to determine the value of x?</h3>

In Statistics, the standardized z-score is giving by this formula:

Z=\frac{\bar{x}\;-\;\mu}{ \sigma }

Making x the subject of formula, we have:

x = Zσ + μ

Substituting the given parameters into the formula, we have;

x = 1.50(20) + 100

x = 30 + 100

x = 130.

Read more on z-scores here: brainly.com/question/4302527

#SPJ4

Complete Question:

For a population with μ= 100 and σ = 20, what is the X value corresponding to z = 1.50?

30

101.5

115

130

6 0
2 years ago
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