1. A new drug has been developed that is found to relieve
nasal congestion in 90 percent of those with the condition.
The new drug is administered to 300 patients with the
condition. What is the probability that more than 265 will
be relieved of nasal congestion?
A: 0.0916
B:0.1922
C:0.8078
D:0.3078
2. For the normal distribution, the mean plus and minus
1.96 standard deviations will include about what percent
of the observations?
A: 50%
B: 99.7%
C: 95%
D: 68%
3. For a standard normal distribution, what is the
probability that
z
is greater than 1.75?
A: 0.0401
B: 0.0459
C: 0.4599
D: 0.9599
4. What is the area under the normal curve between z =
0.0 and z = 1.79?
A: 0.4633
B: 0.0367
C: 0.9599
D: 0.0401
5. What is the area under the normal curve between
z
= –
1.0 and
z
= –2.0?
A: 0.0228
B: 0.3413
C: 0.1359
D: 0.4772
6. The mean amount spent by a family of four on food per
month is $500 with a standard deviation of $75. Assuming
that the food costs are normally distributed, what is the
probability that a family spends less than $410 per
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 Spring '10
 BARCUS
 Normal Distribution, Standard Deviation, nasal congestion

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