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Theoretical Probability

If I draw 30 ...

Question

If I draw 30 face cards in 100 draws of a card (with replacement), then the probability of drawing a number card is?

0.3

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0.7

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0.5

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0.85

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Solution

The correct option is B
0.7

Probability = $\frac{N u m b e r o f f a v o u r a b l e o u t c o m e s}{T o t a l n u m b e r o f o u t c o m e s}$

Number of times a number card was drawn = $100 - 30 = 70$
Probability of drawing a number card = $\frac{70}{100} = 0.7$

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