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Dafna11 [192]
2 years ago
14

Oliva has signed up for snowboarding lessons. Her parents set a limit of 400$ for costs for the season. It costs 250$ to get a m

ountain pass plus 9.5$ for each practice session. What is the maximum number of practice sessions that Olivia can go to?
Mathematics
2 answers:
IrinaK [193]2 years ago
6 0

Answer:

15

Step-by-step explanation:

(400-250) divided by 9.5

vaieri [72.5K]2 years ago
4 0

Answer:

15

Step-by-step explanation:

So, to solve this I made this is 400> or equal to 250+9.5x. X being the number of times she goes to the practices.

400> or equal to 250+9.5x

-250                    -250

150 > or equal to 9.5x

/9.5                       /9.5

15.789> or equal to x

If you then simplify that, you get 15 because you can't necissarily take .789 of a lesson.

Hope this helps!

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Answer:

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Step-by-step explanation:

We are given the following in the question:

A marketing firm is considering making up to three new hires.

Let X be the variable describing the number of hiring in the company.

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\text{P(firm will make at least one hire)}\\= P(x\geq 1)\\=P(x=1) + P(x=2) + P(x=3)\\ = 0.4 + 0.32 + 0.18 = 0.9

b) expected value and the standard deviation of the number of hires.

E(X) = \displaystyle\sum x_iP(x_i)\\=0(0.1) + 1(0.4) + 2(0.32)+3(0.18) = 1.58

E(x^2) = \displaystyle\sum x_i^2P(x_i)\\=0(0.1) + 1(0.4) + 4(0.32) +9(0.18) = 3.3\\V(x) = E(x^2)-[E(x)]^2 = 3.3-(1.58)^2 = 0.80\\\text{Standard Deviation} = \sqrt{V(x)} = \sqrt{0.8036} = 0.89

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