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3 years ago

Please answer... I appreciate it

Mathematics

1 answer:

geniusboy [140]3 years ago

4 0

Answer:A

Step-by-step explanation:Only one that makes sense

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The following function is probability mass function. f left-parenthesis x right-parenthesis equals StartFraction 2x plus 1Over 2

lora16 [44]

Answer:

a) Mean = 2.6

B) Variance = 9.2

Step-by-step explanation:

We are given the following probability mass function in the question:

$F(x) = \dfrac{2x+1}{25}, x = 0,1,2,3,4$

a) Mean of random variable

$\mu = \displaystyle\sum x_iF(x_i)\\\\=0(\dfrac{1}{25}) + 1(\dfrac{2+1}{25}) + 2(\dfrac{4+1}{25}) + 3(\dfrac{6+1}{25}) + 4(\dfrac{8+1}{25})\\\\=\dfrac{3+10+21+36}{25} = \dfrac{70}{25} = 2.8$

b) Variance of the random variable

$\sigma^2 = \displaystyle\sum x_i^2F(x_i)\\\\=0^2(\dfrac{1}{25}) + 1^2(\dfrac{2+1}{25}) + 2^2(\dfrac{4+1}{25}) + 3^2(\dfrac{6+1}{25}) + 4^2(\dfrac{8+1}{25})\\\\=\dfrac{3+20+63+144}{25} = \dfrac{230}{25} = 9.2$

6 0

3 years ago

How many whole groups of 8 can we pull out of 1

vazorg [7]

Answer:

0.125

Step-by-step explanation:

1/8=0.125

4 0

3 years ago

WHICH NUMBERS ARE SOLUTIONS OF EACH INEQUALITY?:

love history [14]

Answer:

I don't know if i am right but i think it is number 7 because it like goes in order

Step-by-step explanation:

i am so unsure so i think it is 7 i don't know for sure

4 0

3 years ago

Which of the following states the conditions that the graph meets?

Viktor [21]

Answer:

x ≤ 3

Step-by-step explanation:

The vertical line at x = 3 is solid and shaded to the left

Therefor

x ≤ 3

8 0

3 years ago

Read 2 more answers

If there is a discount of 40% on an article costing #7000, then the price after discount is

sergejj [24]

Answer:

<h3>The answer is # 4200</h3>

Step-by-step explanation:

A discount of 40% was allowed on the price

To find the price after the discount first calculate the discount and subtract it from the original price

That's

$\frac{40}{100} \times 7000$

= 2800

So the price after the discount is

#7000 - #2800

Which is

Hope this helps you

6 0

3 years ago

Please answer... I appreciate it​

Please answer... I appreciate it