7.22 (10b-3) =7b-14

1 answer:

3 0

Multiply 7.22 onto 10b and -3
new equation - 72.2b-21.66=7b-14

add 21.66 onto -14
new equation - 72.2b=7b+7.66

subtract 7b from 72.2
new equation: 65.2b=7.66

divide 65.2 from b
new equation: b=7.66/65.2

final answer: b=0.117

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Help me find Sample variance and standard deviation

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

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

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

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