Question 1068693
a. This is +/- 2 sds, so a minimum of 75% of the fares will lie between those two values
b. This is +/- 1.5 sds, so a maximum of 1/(1.5)^2 lie outside or 0.444. 1-0.444= 0.556 is the minimum percentage that lie in this interval.
c. This would be 95% by the empirical rule
d. this is 1 sd on either side, so $25.16 and $31.76 are the intervals.