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Hint |
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1) How many people must be present in a room in order to be 100% certain that two people in the room celebrate their birthdays in the same month?
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1. In the worst case, every one in the room has a birthday in a different month up to ____ people.
2. After that, the next one surely has a birthday in a month that someone else has. That number (the next one) is the ____th person.
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2) The table shows the results of many spins that Jules
made with a spinner. Based on these results, what is the
probability that Jules's spinner will land on the apple on
his next spin? Express your answer as a fraction in
lowest terms.
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1. Compute the total number of spins = ____
2. Use this to compute the probability of it landing on apple = ____
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3) Sidney took a survey of her fellow campers at
summer camp and wants to show the results in a bar
graph. She accidentally forgot to put the bar
corresponding to redheads on the graph, but she
correctly showed all other colors. If 50% of the campers
have brown hair, 25 campers have brown hair, 5
campers have green hair, and 10 campers have black
hair, how many of the campers have red hair? Fill in a
bar for the redheads on the graph.
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1. 50% of the campers have brown hair and there are ____ brown haired campers, then there are a total of ____ campers.
2. Subtract the number of campers that have hair other than red from this total.
There are ____ redheads.
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Fill out this table and answer the question.