Hi! I just need help with doing part D. If you coud leave an explanation as well

Question

Hi! I just need help with doing part D. If you coud leave an explanation as well that would be great too. Thank you!

The correct size of a nickel is 21.21 millimeters. Based on that, the data can be summarized into the following table: Too Small Too Large Total Low Income 19 21 40 High Income 10 35 25 44 31 75 Total Based on this data: (give your answers to parts a-c as fractions, or decimals to at least 3 decimal places. Give your to part d as a whole number) a) The proportion of all children that drew the nickel too small is: 4475 Preview Assume that this proportion is true for ALL children (e.g. that this proportion applies to any group of children), and that the remainder of the questions in this section apply to selections from the population of ALL children. b) If 9 children are chosen, the probability that exactly 4 would draw the nickel too small is: 18 Preview c If 9 children are chosen at random, the probability that at least one would draw the nickel too small is: 9997 Preview d) If 110 children are chosen at random, it would be unusual if more than 75 1* Preview drew the nickel too small

Explanation / Answer

Since it is clearly stated that this proportion is true for ALL children, that means it is true for the population. Now, the proportion of children who drew the nickel too small is 44/75, which when multiplied by 110 gives 64.533. So it would be unusual if more than 65 children drew the nickel too small.

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