ACTIVITY 5
 Solutions
Activity 5.1
In each part, indicate, (1) whether the variable is discrete or continuous AND (2) whether it
is binomial or not AND (3) if it is binomial, give values for
n
and
p
.
a.
Number of times a “head” is flipped in 10 flips of a coin
1. Discrete
2. Binomial
3. n = 10, p = 0.5
b.
Time to complete a 30 question multiple choice test
1. Continuous
2. Not Binomial since continuous
c.
Number of correct answers on a 30 question multiple choice test for somebody who randomly guesses
at every question. There are four answer choices for each question,
1. Discrete
2. Binomial – counting correct answers
3. n = 30, p = 0.25
d.
A woman buys a lottery ticket every week for which the probability of winning anything at all is 1/10.
She continues to buy them until she has won 3 times. X = the number of tickets she buys.
1. Discrete
2. Not binomial since the number of trials is not fixed
Activity 5.2
In Stat 200 last year students were asked to rate how much they liked various kinds of music
on a scale of 1 (don’t like at all) to 6 (like very much).
Following is a probability distribution (with one
probability not given) for females’ rating of Top 40 music.
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 '08
 BARROSO,JOAOR
 Statistics, Binomial, Probability, Probability theory

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