The following contingency table shows the number of two-bedroom apartments grouped by monthly rent and location.
Monthly Rent York Lancaster Dover
600 to under 700 6 14 7
700 to under 800 23 17 20
800 to under 900 10 16 12
The probability that a randomly selected apartment from this group was located in York or Lancaster is ________.
A) 0.350
B) 0.435
C) 0.688
D) 0.712
Question 2
The time for a professor to grade an exam is normally distributed with a mean of 16.3 minutes and a standard deviation of 4.2 minutes. The interval around the mean that contains 68 of the times needed to grade exams is ________.
A) 12.1, 20.5
B) 7.9, 24.7
C) 5.8, 26.8
D) 3.7, 28.9
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