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3 years ago

Multiple choice can someone please answer please

Mathematics

1 answer:

Furkat [3]3 years ago

5 0

Answer:

n = 6

Step-by-step explanation:

Since the triangles are similar then the ratio of corresponding sides are equal, that is

$\frac{GH}{QR}$ = $\frac{FH}{PR}$ , substitute values

$\frac{n}{9}$ = $\frac{4}{6}$ ( cross- multiply )

6n = 36 ( divide both sides by 6 )

n = 6

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Options:

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B. 20, 20, 20, 25, 25

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D. 20, 20, 21, 22, 22

Answer:

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Step-by-step explanation:

Required

Which list has a mean of 21 and median of 20

Each of the list have 5 numbers and they've all been sorted.

The median is the number at the 3rd position (i.e. the middle number)

So, list C and D are out because they do not have a median of 20.

Next, calculate the mean of lists A and B

$\bar x = \frac{\sum x}{n}$

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$\bar x = \frac{18 + 20 + 20 + 22 + 25}{5}$

$\bar x = \frac{105}{5}$

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B. 20, 20, 20, 25, 25

$\bar x = \frac{20 + 20 + 20 + 25 + 25}{5}$

$\bar x = \frac{110}{5}$

$\bar x = 22$

Only list A has a median value of 20 and a mean value of 21

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Answer:

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