For questions #17 - 20, as part of a study, 800 college football players are randomly chosen and their weights taken. The distribution of weights is approximately normal. The average weight is 235 pounds and the standard deviation is 25 pounds. 17) Approximately how many players weighed 210 pounds or less? В. 128 A. 64 C. 200 D. 544 18) Assuming there were no outliers, what is the approximate range of player weights? A. 100 lbs B. 150 lbs C. 200 lbs D. 400 lbs 19) Approximately what percentage of players weighed over 285 pounds? A. 95% B. 97.5% C. 2.5% D. 5% 20) Approximately how many players weighed between 210 and 260 pounds? A. 760 В. 128 С. 256 D. 544

Q: can you explain the first few questions aswell

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Q: Is this for question 2 or 3?

A: The standard deviation is 0.2.

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A: The given expression        6-23-5+52

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Permutations and Combinations

If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.

Counting Theory

The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.