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Lecture

# MATH 1P98: 'Chosing' Probabilities

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Brock University

Mathematics

MATH 1P98

Dot Miners

Fall

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‘Chosing’ Probabilities
To finish a board game, you must roll a 6 twice. If you are given 10 rolls, what is the
possibility of ending the game?
2 -2
P(2) = 10(021667) (0.8333)
= 0.2907
What’s the probability of rolling at least two 6’s?
P(≥2) = 1- P(0)-P(1)
0 10 1 0
= 1-(10 (0,667) (0.8333) + C (0.1061) (0.8333)
= 1-0.16144-0.32216
= 0.6609
Ex2: Steve was given a mc test which had 20 questions with options a-d on each. He guesses
every question. What is the probability that Steve will get 50% exactly?
n = 20 ; r = 10 ; P = ¼ = 0.25 ; q = 1-p = 0.75
10 10
P(10) = C200105) (0.75)
= 0.0099
What is the probability h

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