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xenn [34]
3 years ago
8

The equation y−5=−2(x−3) is in point-slope form. Which shows this equation in slope-intercept form?

Mathematics
1 answer:
Tatiana [17]3 years ago
8 0

Add 5 and eliminate parentheses

... y = -2x +6 +5


Simplifying, you get

... B. y = -2x +11

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Answer:

a) Decrease

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Step-by-step explanation:

We are given the following in the question:

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Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}

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New mean =

\text{ New mean} =\dfrac{ \displaystyle\sum x_i +63}{28}\\\\ =\dfrac{2133+63}{28}= \dfrac{2196}{28} = 78.43

Thus, the new mean is 78.43

c) Since the new mean decreases, standard deviation for new scores will decrease.

This is because the new value is within the usual values i.e. within two standard deviations of the mean. So, this wont cause a lot of variation as this value will be closer to already available data values. Also number of observations (n) in the denominator is increasing. Based on both these points we can conclude that standard deviation will decrease

Formula for Standard Deviation:

\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n}}  

where x_i are data points, \bar{x} is the mean and n is the number of observations.

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