Math 9 Homework 5
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MATH 9
HoMEwoRK 5
Perform all of the following in a single Mathematica notebook. Use what we discussed in class: to estimate the probability that some event occurs, perform many trials, and estimate the probability as (# of times the event occurs)/(# of trials)
To estimate the expected value of some random process, perform many trials, and estimate the expected value as
(sum of all outcomes)/(# of trials)
Useful functions: Table, Length, Total, Count, N, RandomInteger, Delete Duplicates, Histogram.
1. Perform the following “experiment” 1000 times: roll 3 six-sided dice and multiply their values. Put the outcomes in a list called multDiceList. Use “Histogram” to view the distribution of the outcomes.
2. Consider the following random process: roll 3 six-sided dice and add their values. Define a variable probSumIs10 that estimates the probability that 10 is produced by this process. ( Use enough trials so that probSumIs10 always looks the same to at least 2 decimal places. If it changes, then use more trials.)
3. Consider the following random process: choose 3 random numbers from 1 to 10 (repeats are allowed) and then select the biggest of those 3 numbers. Define a variable called bigThree in Mathematica that estimates the expected value of this process. (Try computing bigThree a few times. It should always look the same to at least 2 decimal places. If it changes, then use more trials. It should be close to 8 but not equal to 8.)
4. Consider the same process as in the question 3, but selecting the second biggest of the three numbers instead of the biggest. Define a variable called middleThree in Mathematica that estimates the expected value of this middle number.
5. Consider the following random process. Choose 40 different random integers from 1 to 100. Define a variable probDistinct that estimates the probability that such a list of 40 random integers has exactly 30 or 31 different numbers. (For example, there are exactly three different numbers appearing in the length 9 list 1, 7, 1, 2, 1, 1, 7, 2, 2.) Your estimate should be consistent to at least two decimal places.
2022-02-21