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Stat Tutor

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1:07

Correct. There are a total of 9 + 10 + 7 + 8 + 6 = 40 candies, 9 of which are red, so the probability of a red one is 9/40.

Incorrect. There are a total of 9 + 10 + 7 + 8 + 6 = 40 candies, 9 of which are red, so the probability of a red one is 9/40.

2

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Correct. There are a total of 9 + 10 + 7 + 8 + 6 = 40 candies, 9 of which are red and 8 of which are purple, so the probability of a red one is 9/40 + 8/40 = 17/40, because a skittle can only be one color, so red and purple are disjoint events.

Incorrect. There are a total of 9 + 10 + 7 + 8 + 6 = 40 candies, 9 of which are red and 8 of which are purple, so the probability of a red one is 9/40 + 8/40 = 17/40, because a skittle can only be one color, so red and purple are disjoint events.

2

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Correct. There are a total of 9 + 10 + 7 + 8 + 6 = 40 candies, 6 of which are green, so the probability of not getting a green one is 1 - 6/40.

Incorrect. There are a total of 9 + 10 + 7 + 8 + 6 = 40 candies, 6 of which are green, so the probability of not getting a green one is 1 - 6/40.

2

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Correct. With 50 students and 52 majors, there must be at least two with double majors in both biology and chemistry. Being a biology major doesn’t mean you can’t also be a chemistry major, so these events are not disjoint.

Incorrect. With 50 students and 52 majors, there must be at least two with double majors in both biology and chemistry. Being a biology major doesn’t mean you can’t also be a chemistry major, so these events are not disjoint.

2

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