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baherus [9]
3 years ago
7

Please help what's the answer

Mathematics
2 answers:
Dmitry [639]3 years ago
8 0

A is the answer to the question

Hope it helps

dalvyx [7]3 years ago
8 0

Answer:

the answer is A

Step-by-step explanation:

(4, 1)

x = 4 y = 1

x + 2y = 6

4 + 2(1) = 6

4 + 2 = 6

x - y = 3

4 - 1 = 3

hopefully this helps :)

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Mean = 47

n = 6

s= 16.56

\sqrt n = 2.45

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Step-by-step explanation:

Given: The above data

Solving (a): Mean of each group

Mean is calculated as:

Mean = \frac{\sum x}{N}

Mean = \frac{55 + 31 + 58 + 20 + 47 + 37+68 + 32 + 85 + 69 +58 + 52+26 + 47 + 30  +35 + 53 + 43}{18}

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n = 6

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s = \sqrt{\frac{\sum (x - \bar x)^2}{N}}

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s= \sqrt{\frac{(55 - 47)^2 + (31  - 47)^2 +......... + (43 - 47)^2}{18}}

s= \sqrt{\frac{4936}{18}}

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