The probability is 0.45 that a traffic fatality involves an intoxicated or​ alcohol-impaired driver or nonoccupant. In n

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The probability is
0.45
that a traffic fatality involves an intoxicated
or​ alcohol-impaired driver or nonoccupant. In
nine
traffic​ fatalities, find the probability that
the​ number, Y, which involve an intoxicated
or​ alcohol-impaired driver or nonoccupant is
a. exactly​ three; at least​ three; at most three.
b. between
two
and
four​,
inclusive.
c. Find and interpret the mean of the random variable Y.
d. Obtain the standard deviation of Y.
Question content area bottom
Part 1
a. The probability that exactly three traffic fatalities involve
an intoxicated or​ alcohol-impaired driver or nonoccupant
is
enter your response here.
​(Round to four decimal places as​ needed.)
Part 2
The probability that at least three traffic fatalities involve
an intoxicated or​ alcohol-impaired driver or nonoccupant
is
enter your response here.
​(Round to four decimal places as​ needed.)
Part 3
The probability that at most three traffic fatalities involve an
intoxicated or​ alcohol-impaired driver or nonoccupant is
enter your response here.
​(Round to four decimal places as​ needed.)
Part 4
b. The probability that between
two
and
four
traffic​ fatalities, inclusive, involve an intoxicated
or​ alcohol-impaired driver or nonoccupant is
enter your response here.
​(Round to four decimal places as​ needed.)
Part 5
c. The mean of Y is
enter your response here.
Part 6
Choose the correct interpretation of the mean below.
A.On​ average, of
nine
traffic​ fatalities, this many will involve an intoxicated
or​ alcohol-impaired driver or nonoccupant.
B.In every
nine
traffic​ fatalities, exactly this many will involve an
intoxicated or​ alcohol-impaired driver or nonoccupant.
C.
On​ average, of this many traffic​ fatalities, 1 will
involve an intoxicated or​ alcohol-impaired driver or
nonoccupant.
Part 7
d. The standard deviation of Y is
enter your response here.
​(Round to two decimal places as​ needed.)