If there are 9 girls and 11 boys in a class, what percentage of the class are girls

1 answer:

6 0

1. Find the total number of class members
9 + 11 = 20

2. Find 9 as a percentage of 20
9 / 20 = 0.45
0.45 x 100 = 45%

<u>45% of the class are girls.</u>

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Consider a game in which players draw playing cards one at a time from a standard 52-card deck. If a player draws a face card (a

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Answer:

Expected value of drawing a card in this game on the first turn = 6

Step-by-step explanation:

Given - Consider a game in which players draw playing cards one at a time from a standard 52-card deck. If a player draws a face card (a jack, a queen, or a king), the player is awarded 16 points. Any other card drawn earns the player 3 points.

To find - What is the expected value of drawing a card in this game on the first turn?

Formula used -

Expected value, E[x] = ∑ x p(x)

where p(x) is the probability

Proof -

Total cards in a standard deck = 52

Total face cards = 12 (a jack, a queen, or a king)

Other cards = 40

Now,

Probability of getting a face card = $\frac{12}{52}$