The sample proportion of the the students that took fewer than the mean number of electives is given by the number of people who took less that the mean number of electives (i.e. 7.63) divided by the total number of students in the sample (i.e. 19). The total number of people who took less than 7.63 electives is 10. Therefore, the required sample proportion is 10 / 19.
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1. c
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<span>If (x, 7√3) is a point on the unit circle, then x2 + (7√3)2 = 1 and </span>-1 ≤ x ≤ 1. <span>So, x2 = 1- (7√3)2 = 1- 147 = -146</span> <span>Since there is no value of x where -1 ≤ x ≤ 1 and x2 = -146, the given point is NOT on the unit circle.
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