KEY
Project Two ____
Chapter 6 Use complete sentences when appropriate; u
se complete mathematical sentences when
appropriate. Failure to do so may result in a lower score. S
how all your work. Indicate clearly the
methods you use, because you will be graded on the
correctness
of your methods as well as on the
accuracy
of your results and
explanation.
If you present
parallel solutions
, I will grade the
lesser of the two.
1. Given the following probability distribution:
X P(X)
3 .4
4
5 .1
6 .2
(a) What is P(x=4)?
P(X = 4)
=
1 –(.4+.1+.2)
=.3
(b) Find the mean and standard deviation of this distribution.
Use IT :
mean = 4.1 and
standard deviation is 1.136
*************************************************************************************
2. According to a currently report 67% of murders are committed with a firearm. Suppose
that 30 murders were randomly selected and the number of murders committed with a
firearm is recorded. (assume a binomial distribution)
(a) Compute and interpret the probability that exactly 25 murdered were committed using
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 Spring '10
 Applebaugh
 Math, Statistics, TED, fi rearm, potholes, complete mathematical sentences

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