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AlladinOne [14]
3 years ago
12

1. Mariana took 50 minutes to complete her math assignment. She took 2 minutes to solve each problem and 10 minutes to check her

work on the entire
assignment.
Which value is not given in this scenario and could be assigned a variable?
O A. the time in minutes it took Mariana to complete her assignment
OB. the time in minutes it took Mariana to complete each problem
OC. the time in minutes it took Mariana to check her work
OD. the number of math problems on the assignment
3 attempts remaining
Check My Answer
Mathematics
1 answer:
Anarel [89]3 years ago
6 0

Answer:

D

Step-by-step explanation:

It's the only thing not listed aka the number of math problems.

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The expected value of the game is its average earnings

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<h3>How to determine the expected value of a round</h3>

There are 12 cards with a value of 4 or less.

So, the probability of selecting a card with a value of 4 or less is:

P(x \le 4) = \frac{12}{52}

The probability of selecting a card with a value more than 4 is the complement of the above probability.

So, we have:

P(x > 4) = 1 - \frac{12}{52}

P(x > 4) =  \frac{40}{52}

The expected value is then calculated as:

E(x) = \frac{12}{52} * 43 - \frac{40}{52} * 10

Evaluate

E(x) = \frac{12* 43 - 40 * 10}{52}

E(x) = \frac{116}{52}

Simplify

E(x) = 2.23

Hence, the expected value of a round is $2.23

<h3>The expected value when the game is played 755 times</h3>

In (a), we have:

E(x) = 2.23

In probability, we have:

E(nx) = n * E(x)

So, we have:

E(755x) = 755 * 2.23

E(755x) = 1683.65

Hence, the expected value when the game is played 755 times is $1683.65

Read more about expected values at:

brainly.com/question/15858152

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