Examine the graph. A bar graph titled Population of North American Cities. The x-axis is labeled cities. The y-axis is labeled P
2 answers:
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a. Let be a random variable representing the weight of a ball bearing selected at random. We're told that
, so
where . This probability is approximately
b. Let be a random variable representing the weight of the
-th ball that is selected, and let
be the mean of these 4 weights,
The sum of normally distributed random variables is a random variable that also follows a normal distribution,
so that
Then
c. Same as (b).
We use the theory of Pythagoras because the triangle is right.
since AB = AC = x
since AB = AC = x