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BUAD 310
Applied Business Statistics
In-Class Practice
9/1/10
Standard Normal Table
2

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mean and 1.26.
• Find the area under the std normal curve between
z
= 1.2
and
z
= 1.6.
• Find the probability that a std normally distributed r.v. will
lie below
z
= 2.
• Find the area under the std normal curve below
z
= -1.26.
3
The average amount of salt consumed per day by an American is 15
grams (the actual physiological minimum daily requirement for salt is
only 220 milligrams).
Suppose that the amount of salt intake per day
is approximately normally distributed with a standard deviation of 5
grams.
What proportion of all Americans consume between 14 and
22 grams of salt per day?
Physicians recommend that those Americans who want to reach a level
of salt intake at which hypertension is less likely to occur should
consume less than 1 gram of salt per day.
What is the probability
that a randomly selected American consumes less than 1 gram of salt
per day?
4

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