3 years ago

X + 3.75 = 7 i need an answer please. i need help

Mathematics

2 answers:

BigorU [14]3 years ago

7 0

Step-by-step explanation:

3.25 is the answer :) have a good day

Norma-Jean [14]3 years ago

4 0

Answer:

= 3.25

(hope this helps)

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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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