3/4(-10+2/5) Please help I will mark branliest

Mathematics

2 answers:

konstantin123 [22]3 years ago

8 0

I think its -36/5 or -7 1/5, or -7.2 but im not entirely sure so

In-s [12.5K]3 years ago

4 0

Answer:

-36/5

Step-by-step explanation:

its 36/5 but the whole thing is negative

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The probability model below describes the number of repair calls that an appliance repair shop may receive during an hour. Compl

defon

Answer:

a) So, she can expect a 2.4 calls per hour.

b) So, the standard deviation is 0.8.

Step-by-step explanation:

We know that probability model below describes the number of repair calls that an appliance repair shop may receive during an hour.

Repair Calls 1 2 3 4

Probability 0.1 0.5 0.3 0.1

a) We calculate how many calls should the shop expect per hour.

We get:

$E(X)=1\cdot0.1+2\cdot0.5+3\cdot0.3+4\cdot0.1\\\\E(X)=0.1+1+0.9+0.4\\\\E(X)=2.4$

So, she can expect a 2.4 calls per hour.

b) We calculate the standard deviation:

$\sigma=\sqrt{(1-2.4)^2\cdot 0.1+(2-2.4)^2\cdot 0.5+(3-2.4)^2\cdot 0.3+(4-2.4)^2\cdot 0.1}\\\\\sigma=\sqrt{0.196+0.08+0.108+0.256}\\\\\sigma=\sqrt{0.64}\\\\\sigma=0.8$

So, the standard deviation is 0.8.

3 0

3 years ago

I really need help...

lianna [129]

It could not be 73º because if you add that to 120 then it will be more than 180 degrees, which is the total number of degrees in a triangle. Hope this helps!

8 0

3 years ago

Read 2 more answers

The table shown below represents a function. Which of the following values could not be used to complete the table?

geniusboy [140]

<u>Answer:</u>

20 -20 0-15 0-5

<u>Step-by-step explanation:</u>

The original graph

<u>Hope this helps you :)</u>

7 0

3 years ago