(*Note: this was changed/updated during period F Friday)
Weekend HW: p. 381-383 : 3/11, 5, 7, 15, 21
- This homework provides some key practice--be sure to do it thoroughly, check your answers, and more so, if you got something wrong go back and figure out your mistake!
- We have to move quickly to finish our unit before break, so it's important you get this practice on your own, as we won't have a ton of time to practice in class.
- For #3 you need to know about a deck of cards...
- There are 52 total cards
- There are 13 spades, 13 clubs, 13 hearts, and 13 diamonds (13 of each suit)
- There is one Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King, for each suit
- So, there are 4 Aces, 4 2's, 4 3's, and so on...
- For 5ab you want to use a probability model for the number of children...
- But for 5c you want the expected number of boys, so you need a new model showing "# of boys" as your outcome rather than "# of children"
- For 11 and 15b:
- To find standard deviation we need to use our graphing calculator!
- Enter the outcomes in L1, probabilities in L2
- Go to STAT --> CALC --> 1 Var Stat
- XList = Outcomes (L1), FreqList = Probabilities (L2)
- Or, if you have an older model, when "1 Var Stat" pops up you need to type "1 Var Stat Outcome List, Probability List" or "1 Var Stat L1, L2."
- Standard deviation = sigma
- Expected value = mean
- Do 15a and b both on the calculator!
- ALWAYS CHECK YOUR ANSWERS IN THE BACK OF THE BOOK. Then, if you got something wrong, go back and try to figure out the correct approach!
Want to get ahead? Here's Monday's HW:
- Feel free to do the work on separate paper; I'll give you copies of this Monday
- Monday's HW: Understanding Expected Value (Click Me!)
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