## Exam Information

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## Sample Document Text

--------------------------------~-~
Stat 100
Exam 2A
Spring 2005
Calculators allowed All work must be shown to receive full credit.
1. 60% of flights at an airport depart on time. Determine the probability that, of 14 randomly
selected flights:
a) (5 pts) at least 6 depart on time
b) (5 pts) at most 5 do not depart on time
c) (5 pts) exactly 8 depart on time.
d) (5 pts) Use the normal approximation to find the approximate probability that out of350
randomly selected flights, less than 200 depart on time.
2. For the probability density function depicted at right:
.2 bf(X)
5
a) (6 pts) find P(2 < X < 3)
b) (6 pts) find P(X> 3)
c) (8 pts) find the median and the quartiles.
3. For the standard normal variable, Z, find:
a) (6 pts) P(Z> -1.79)
b) (7 pts) z such that P(-.6 < Z < z) =.5
c) (7 pts) the 40
th
percentile of the standard normal distribution.
4. A survey finds that students at a university use computers an average of7 hours per week
with standard deviation ...

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