2 years ago

Simplify the expression. 2.4 - 4.3n - 3n + 6

Mathematics

2 answers:

Fiesta28 [93]2 years ago

6 0

Answer:

-7.3n+8.4

Step-by-step explanation:

combine like terms

Hope this helps! Have a great day!!

ICE Princess25 [194]2 years ago

5 0

Answer:

8.4 - 7.3n

Step-by-step explanation:

1. Rearrange

2.4 - 4.3n - 3n + 6 = 2.4 + 6 - 4.3n - 3n

2. Combine like terms

2.4 + 6 - 4.3n - 3n = 8.4 - 7.3n

The answer is 8.4 - 7.3n

Hope this helps :)

Have a great day!

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2 years ago

Help me find Sample variance and standard deviation

AnnZ [28]

First, find the mean. You'll need it to compute the variance.

$\bar x=\displaystyle\frac15\sum_{i=1}^5x_i=\dfrac{21+10+6+7+11}5=11$

The variance of the sample is then computed with the formula

$s^2=\displaystyle\dfrac1{5-1}\sum_{i=1}^5(\bar x-x_i)^2=\dfrac{(21-11)^2+\cdots+(11-11)^2}4=\dfrac{71}2=35.5$

The standard deviation is the square root of the variance, so

$s=\sqrt{35.5}\approx5.958$