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Solution |
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3) Four friends, Amber, Becky, Callie, and Darcy went to a party. If Callie was the third to arrive, how many different orders could the other three friends have arrived in?
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The number of permutations of 3 things is 3 x 2 x 1 = 6
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4) After three tests Max has a test average of 83. He is nervous for the fourth test and wants to keep an average of at least 80. What is the lowest score he can get on the fourth test if each test is worth 100 points?
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The equation for the mean:
(83 + 83 + 83 + X)/4 = 80
(249 + X)/4 = 80
249 + X = 320
X = 320 - 249 = 71
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5) A class of 21 children goes to the gym to measure its length in paces. The bar graph shows the distribution for the number of paces it took to traverse the gym lengthwise. All numbers are whole numbers. From the graph which bar contains the median number of paces?
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After you cross off the first 4 highest and lowest you should notice that there are more in the 46-50 pace column than in the 41-45 pace column, making the median number of paces fall in the 46-50 pace length bar.
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