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patriot [66]
3 years ago
12

Pls do answer correct for brainliest

Mathematics
2 answers:
olga55 [171]3 years ago
6 0

Answer:

3 \frac{1}{9}

PilotLPTM [1.2K]3 years ago
4 0

Answer:

3\frac{1}{9}

Step-by-step explanation:

First, make the denominator the same.

We will get 6 \frac{3}{9} - 3\frac{2}{9}.

Now, both denominators are both 9 and it's easier to calculate this way.

Subtract: 6\frac{3}{9} -3\frac{2}{9}.

We will get 3 \frac{1}{9}.

Hope this helps!

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Calculate the expected value, the variance, and the standard deviation of the given random variable X. (Round all answers to two
Tom [10]

Answer:

E (X) = 1.8

Var (X) = 0.36

σ = 0.6

Step-by-step explanation:

Solution:-

- Denote the random variable X : is the number of red marbles that Suzan has in her hand after she selects three marbles.

- Total sample space (bag) have the following quantity of colored marbles:

                Bag : { 3 Red , 2 Green }

- Suzan selects three marbles from the bag. The Event (X) defines the number of red marbles out of 3.

- The total number of outcomes / selections for randomly selecting 3 balls from the bag:

               All outcomes = 5 C 3 = 10

- The probability distribution of the random variable X, we will use combinations to determine the required probabilities:

  X = 1 red marble:

        P ( X = 1 ) : Suzan chooses 1 Red marble from the available 3 red marble and 2 green marbles.

        P ( X = 1 ) = [ 3C1*2C2 ] / all outcomes = (3*1) / 10 = 0.3

X = 2 red marble:

        P ( X = 2 ) : Suzan chooses 2 Red marble from the available 3 red marble and 1 green marbles.

        P ( X = 2 ) = [ 3C2*2C1 ] / all outcomes = (3*2) / 10 = 0.6

X = 3 red marble:

        P ( X = 3 ) : Suzan chooses 3 Red marble from the available 3 red marble.

        P ( X = 3 ) = [ 3C3] / all outcomes = (1) / 10 = 0.1

- The probability distribution is as follows:

          X :         1                 2                3

       P (X):       0.3            0.6              0.1

- The expected value E(X) for the given random variable X is:

                E ( X ) = ∑Xi*P(Xi)

                           = 1*0.3 + 2*0.6 + 3*0.1

                           =1.8

- The variance Var(X) for the given random variable X is:

                Var ( X ) = ∑Xi^2*P(Xi) - [ E(X) ] ^2

                               = 1^2*0.3 + 2^2*0.6 + 3^2*0.1 - 1.8^2

                               = 0.36

- The standard deviation for the given random variable X is:

                σ = √Var(X)

                σ = √0.36

                σ = 0.6

5 0
3 years ago
What is 8blank7 hundred divided by 4 equal
Gnoma [55]
\frac{870}{4} = \frac{435}{2} 


<span>(Decimal: 217.5)
</span>
For if its
\frac{8700}{4}

Then is =2175

~ Hope this helps 
3 0
3 years ago
It takes 1 gallon of gas to drive 25 miles. which measure of efficiency is this an example of
Brilliant_brown [7]
Are these the choices? <span>Cost, Time, Pace, Materials? 

I think the answer would be - it is a measure of the efficiency of the materials used in the car. Since this talks about how many gallons of gas a drive of 25 miles would consume. </span>
8 0
3 years ago
How to solve it and what thw answer is
vichka [17]
Idk i’m just trying to get my answer same bro
5 0
3 years ago
Read 2 more answers
How do you calculate time by speed and distance?
professor190 [17]

Answer:

t=d/s

Step-by-step explanation:

search up distance speed time triangle (like the one attached) and memorize it. When u need to use it just draw it on a piece of paper and cover ur intended target. For example, if u want to find the time formula, cover the time section and you got the time formula, D/S. It helps for beginners.

5 0
3 years ago
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