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3 years ago

Evaluate a/b for a = -6 and b = -2. -12

Mathematics

1 answer:

lisov135 [29]3 years ago

4 0

Answer:

Step-by-step explanation:

If a = -16 and b = -2, just substitute the values in for the equation.

a/b = -16/-2

The negatives cancel out, since both the numerator and denominator are both negative.

-16/-2 = 16/2

If you symplify, you get 8.

So, your answer is 8

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Find the standard deviation for the group of data items 4, 4, 4, 4, 6, 8 The standard deviation is (Simplify your answer. Round

marysya [2.9K]

Answer: 1.53

Step-by-step explanation:

The given data : 4, 4, 4, 4, 6, 8

Number of data values : n= 6

The mean value of the given data will be :-

$\overline{x}=\dfrac{\sum_{i=1}^{6}x_i}{n}\\\\\Rightarrow\ \overline{x}=\dfrac{30}{6}=5$

The formula to find standard deviation:_

$\sqrt{\dfrac{\sum(x-\overline{x})^2}{n}]$

Now,

$\sum_{i=1}^{6}(x_i-\overline{x})^2=(-1)^2+(-1)^2+(-1)^2+(-1)^2+(1)^2+(3)^2\\\\=1+1+1+1+1+9=14$

The standard deviation will be :-

$\sigma=\sqrt{\dfrac{14}{6}}\approx1.53$

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