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3 years ago

Help with the ones that aren’t answered plz

Mathematics

2 answers:

Delicious77 [7]3 years ago

7 0

-12 - (-5) = -7

-13 - (-5) = -8

-20 - (-4) = -16

-22 - (-11) = -11

10 - (-12) = 22

-3 - 2 = -5

-4 - 6 = -10

-5 - 5 = -10

0 - 6 = -6

il63 [147K]3 years ago

4 0

All of her answers are correct ^

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The Solution:

Given:

Required:

Find the standard deviation of the probability distribution.

Step 1:

Find the expected value of the probability distribution.

$E(x)=\mu=\sum_{i\mathop{=}0}^3x_iP_(x_i)$ $\begin{gathered} \mu=(0\times0.25)+(1\times0.05)+(2\times0.15)+(3\times0.55) \\ \\ \mu=0+0.05+0.30+1.65=2.0 \end{gathered}$

Step 2:

Find the standard deviation.

$Standard\text{ Deviation}=\sqrt{\sum_{i\mathop{=}0}^3(x_i-\mu)^2P_(x_i)}$ $=(0-2)^2(0.25)+(1-2)^2(0.05)+(2-2)^2(0.15)+(3-2)^2(0.55)$ $=4(0.25)+1(0.05)+0(0.15)+1(0.55)$ $=1+0.05+0+0.55=1.60$

Thus, the standard deviation is 1.60

Answer:

1.60