1. In a population of chickens, the average (arithmetic mean) weight is 6.3 pounds, and the standard deviation is 1.2 pounds. Which of the following weights (in pounds) are within 1.5 units of standard deviation of the mean?
Indicate all weights.
ⓐ 4.4
ⓑ 4.6
ⓒ 5.1
ⓓ 5.2
ⓔ 6.9
ⓕ 7.6
ⓖ 7.7
ⓗ 8.2
2. A popular website requires users to create a password consisting of digits only. If no digit may be repeated and each password must be at least 9 digits long, how many passwords are possible?
ⓐ 9! + 10!
ⓑ 2 × 10!
ⓒ 9! × 10!
ⓓ 19!
ⓔ 20!
3. The greatest prime factor of 144 is x / The greatest prime factor of 96 is y
Column A: x
Column b: y
ⓐ The quantity in Column A is greater
ⓑ The quantity in Column B is greater
ⓒ The two quantities are equal
ⓓ The relationship cannot be determined from the information given
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