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2 years ago

NEED HELP ON THIS PLEASE! Oregon Trail: Percents.

Mathematics

1 answer:

harina [27]2 years ago

5 0

1845-1846

118->148

148-118 = 30 = change

percent

30/118 ≈ 25.4%

1846-1847

148->139

148-139 = 9 = change

percent

9/148 ≈ 6%

1847-1848

139->151

151-139 = 12 = change

percent

12/139 ≈ 8.6%

Hope this helped :)

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An individual who has automobile insurance from a certain company is randomly selected. Let y be the number of moving violations

Hoochie [10]

Answer:

a) $E(Y)= \sum_{i=1}^n Y_i P(Y_i)$

And replacing we got:

$E(Y) = 0*0.45 +1*0.2 +2*0.3 +3*0.05= 0.95$

b) $E(80Y^2) =80[ 0^2*0.45 +1^2*0.2 +2^2*0.3 +3^2*0.05]= 148$

Step-by-step explanation:

Previous concepts

In statistics and probability analysis, the expected value "is calculated by multiplying each of the possible outcomes by the likelihood each outcome will occur and then summing all of those values".

The variance of a random variable Var(X) is the expected value of the squared deviation from the mean of X, E(X).

And the standard deviation of a random variable X is just the square root of the variance.

Solution to the problem

Part a

We have the following distribution function:

Y 0 1 2 3

P(Y) 0.45 0.2 0.3 0.05

And we can calculate the expected value with the following formula:

$E(Y)= \sum_{i=1}^n Y_i P(Y_i)$

And replacing we got:

$E(Y) = 0*0.45 +1*0.2 +2*0.3 +3*0.05= 0.95$

Part b

For this case the new expected value would be given by:

$E(80Y^2)= \sum_{i=1}^n 80Y^2_i P(Y_i)$

And replacing we got

$E(80Y^2) =80[ 0^2*0.45 +1^2*0.2 +2^2*0.3 +3^2*0.05]= 148$

5 0

2 years ago

There are ten cookies in the cookie jar. 3 are Oreos. 2 are peanut butter cookies. 4 are chocolate chip cookies, 1 is a sugar co

Darya [45]

Answer:

If there's 10 cookies in the jar, and if 2 are peanut butter, the fraction for peanut butter cookies is 1/5, simplified.

Step-by-step explanation:

Given:

10 Cookies Total
3 are Oreo cookies
2 are peanut butter cookies
4 are chocolate chip cookies
1 is a sugar cookie

Bolded text represents what we'll be focusing on.

2 of the cookies are peanut butter, and there's 10 cookies total.

As a fraction, the peanut butter cookies are represented as:

2/10.

2/10 represents 2 peanut butter cookies out of 10 cookies altogether.

Simplify:

2/10 can be simplified by dividing both numerator and denominator by 2:

Quotient: 1/5.

1/5 is your answer.

5 0

1 year ago

identify the vertex of the graph tell whether minimum or is it maximum. y equals -1 and xbox equals -4

Kobotan [32]

Answer:

it minimum

Step-by-step explanation:

you didn't really give an equation

3 0

3 years ago

1/2 x^3 = 125/2 x=-5?

vlada-n [284]

ANSWER:

125/2 =125/2

PROVED

STEP BY STEP EXPLANATION

PUTTING THE VALUE OF X, WE HAVE

1/2×5×5×5=125/2

1/2×125=125/2

125/2=125/2

HENCE ,L.H.S =R.H.S

PROVED.

HOPE THIS WILL HELP YOU

3 0

2 years ago

How do I solve this problem?

Margaret [11]

Ask google or maybe YouTube

7 0

2 years ago