2 years ago

Could someone please help me and fast?

Mathematics

1 answer:

grandymaker [24]2 years ago

5 0

Answer:

141

Step-by-step explanation:

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2 years ago

Find the mean and the standard deviation for each set of values. Show your work. 15,17,19,20,14,23,12

vekshin1

1. Mean.

$\overline{x}=\dfrac{15+17+19+20+14+23+12}{7}=\dfrac{120}{7}\approx\boxed{17.14}$

2. Standard deviation.

First we have to square each value and calculate the mean of that squares:

$\overline{x^2}=\dfrac{15^2+17^2+19^2+20^2+14^2+23^2+12^2}{7}=\boxed{\dfrac{2144}{7}}$

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$s=\sqrt{s^2}=\sqrt{12.41}\approx\boxed{3.52}$

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