Help please! answer by today.

Mathematics

2 answers:

madreJ [45]2 years ago

7 0

Answer:

-5.50

Step-by-step explanation:

it’s -5.5. You just subtract -0.25 on the side where it’s negative and add 0.25 for the side that’s positive.

finlep [7]2 years ago

4 0

Answer: B = -5.5

Step-by-step explanation:

1. B is found 2 intervals between both -5 and -6.

2. Each interval would be 0.25, as there are 4 intervals found between each number. ( $\frac{1}{4} =0.25$ )

3. Hence, $2*0.25=0.5$ , and hence $-5-0.5=-5.5$ (or $-6+0.25=-5.5$ ).

You might be interested in

A market research team compiled the following discrete probability distribution, where X represents the number of automobiles ow

rodikova [14]

Answer:

The standard deviation of X is 0.7

Step-by-step explanation:

We are given the following distribution:

x: 0 1 2 3

P(x): 0.3 0.5 0.2 0.4

We have to find the standard deviation of X.

Formula:

$E(x) = \displaystyle\sum x_iP(x_i)\\\\E(x) =0(0.3) + 1(0.5) + 2(0.2) + 3(0.4)\\\\E(x) = 2.1\\\\E(x^2) = \displaystyle\sum x_i^2P(x_i)\\\\E(x^2) =0(0.3) + 1(0.5) + 4(0.2) + 9(0.4)\\\\E(x^2) = 4.9\\\\Var(x) = E(x^2) - (E(x))^2 = 4.9-(2.1)^2 = 0.49\\\\\sigma(x) = \sqrt{Var(x)} =\sqrt{0.49} = 0.7$