Represent and Determine Probability Question
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Grade 10 Represent and Determine Probability CCSS: HSS-CP.B.7
Haley is collecting coins. She specifically likes to look for older coins or coins from other countries. Knowing this, her friend Andy decides to bring her a bag of coins he found in his grandfather's attic that nobody in his family wanted. There are 20 coins in the bag. Recently Haley read that, for most coin collections, 20% of the coins are from foreign countries and 70% are from the year 1932 and before. Assuming that this information is correct, she reasons that there are about 18 coins which she really wants (that are old or from a foreign country). Is she correct?
- Yes, she took both percentages, added them together, and then multiplied by 20.
- No, she doesn't know how many of the foreign coins are from before 1932, which would reduce the number of coins she wants to keep.
- No, she needs to multiply these percentages. Therefore, there are only about 3 coins she would want to keep.
- No, only one of the percentages applies. In order to not miss any coins she might want, she should go with the greater percentage, 70%. Therefore, she will keep about 14 coins.