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# /Probability - Statistics Project Example

Summary
In 2001 the stock market took some big swings up and down. One thousand investors were asked how often they tracked their investments. The table below shows their responses. What is the probability that an investor tracks the portfolio monthly?
a. In a battleground state,…

## Extract of sample "/Probability"

Be sure to show your work so that partial credit may be awarded. To receive full credit, work must be shown if applicable. Section 3 Basic Concepts of Probability and Counting
1. Lock combinations are made by using 4 digits. How many different lock combinations can be made if repetition of digits is allowed?
Each place in the 4 digit number can be occupied by any of the 10 digits. Hence by the multiplication theorem of probability, we get
No of different combinations = 10 × 10 × 10 × 10 = 10000 combinations

2. In 2001 the stock market took some big swings up and down. One thousand investors were asked how often they tracked their investments. The table below shows their responses. What is the probability that an investor tracks the portfolio monthly?
How often tracked?
Response
Daily
235
Weekly
278
Monthly
292
Few times a year
136
Do not track
59
Hence there is a 29.2% probability that an investor tracks the portfolio, every month.
Section 3.2: Conditional Probability and the Multiplication Rule
3.
a. In a battleground state, 36% of all voters are Republicans. Assuming that there are only two parties - Democrat and Republican, if two voters are randomly selected for a telephone survey, what is the probability that they one is a Democrat followed by a Republican? Round your answer to 4 decimal places.
The probability that the first person chosen is a democrat = 64%
Now, the probability that the next person selected is a Republican, assuming a large population size = 36%

Hence, probability that first person selected is a Democrat and the next is a Republican = 0.64 * 0.36 = 0.2304 = 23.04%

b. You are dealt 2 cards from a shuffled deck of 52 cards, without replacement. What is the probability that the first card is a King and the second card is a Queen? Round your answer to 3 decimal places.

There are 4 kings and queens in a standard deck.
The probability that first card drawn is a king = 
The next card is drawn without replacement. Hence the probability that it is a queen = 
By the multiplication theorem the required probability = 
4. The table below shows drink preferences for people in 3 different age groups. If one of the 255 subjects is randomly chosen, what is the probability that the person prefers orange juice, given they are under 21? Round your answer to 3 decimal places.
Water
Orange juice
Cola
Under 21 years
40
25
20
21 – 40 years
35
20
30
Over 40 years
20
30
35
Given that they are under 21, the probability that the person prefers orange juice is given by 25/85 = 0.294=29.4%

5. a. The table below shows the drinking habits of adult men and women.
Non-Drinker
Occasional Drinker
Regular Drinker
Heavy Drinker
Total
Men
387
45
90
37
559
Women
421
46
69
34
570
Total
808
91
159
71
1,129
If one of the 1,129 people is randomly chosen, what is the probability that the person is a woman or a non-drinker. Round your answer to 3 decimal places.)
Let A be the event of the selected person being a woman
Let B be the event of the selected person being a non-drinker
Hence P(A) = 570/1129 = 0.505
P(B) = 808 /1129 = 0.717
P(A∩B) denotes the probability of the selected person, being both a woman and a non-drinker, and this is equal to 421/1129 = 0.373
The probability that selected person is a woman or a nondrinker is denoted as P(A∪B)
From the addition rule of probability
P(A∪B) = P(A) + P(B) - P(A∩B) = 0.505+0.717-0.373 = 0.849 = 84.9%
Hence there is 84.9% probability of the selected person being a woman or a non-drinker

b. The table below shows the drinking habits of adult men and women.
Non-Drinker
Occasional Drinker
Regular Drinker
Heavy Drinker
Total
Men
387
45
90
37
559
Women
421
46
69
34
570
Total
808
91
159
71
1,129
If one of the 1,129 people is randomly chosen, what is the probability that the person is a non-drinker or a heavy drinker. Round your answer to 3 decimal places.
Let A be the event of the selected person being a non-drinker
Let B be the event of the selected person being a heavy drinker
Hence P(A) = 808 /1129 = 0.717
P(B) = 71 /1129 = 0.063
The events A and B are mutually exclusive i.e a person cannot be both a non-drinker and a heavy drinker. Hence P(A∩B) is zero
The probability that selected person is a non-drinker or a heavy drinker is denoted as P(A∪B)
Then from the addition rule of probability
P(A∪B) = P(A) + P(B) = 0.717 + 0.063 = 0.780=78%
Hence there is a 78% probability of the selected person being a non-drinker or a heavy drinker. Read More
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