Let's go:10)
Imagine that airline makes 100 flights. Of these 100 flights, 83 depart on schedule. Of those 83 who depart on schedule, 68% departs and arrives on schedule. So:
83 × 0,68 = 56,44 of 100 = aproximately 0,56%
Alternative A)
11)
a) false:
A = 39,125; B = 37,25
b) the range of ages in both groups is almost same.
c) false. The mode of group B is 40, but the mode of group A is 36.
d) true:
A = 32, 36, 36, (37), (41), 42, 44, 45
(37 + 41)/2 = 78/2 = 39
B = 26, 36, 36, (38), (40), 40, 40, 42
(38 + 40)/2 = 78/2 = 39
I Hope I helped you.
