I know, the Giants are terrible.
Here are the answers to the even homework problems so you can see that you got everything right!
8.) a. Standard deviation allows us to know something about the life spans' consistency and the chances they each battery will last a certain amount of time.
b. RockReady is more likely to last all day. Its mean is larger and standard deviation is smaller, meaning it generally lasts longer and is more consistent in its life spans.
c. 16 hours is z=2.5 SD's higher than DuraTune's mean and z=2.67 standard deviations (SD's) higher than RockReady's mean. Neither battery has a great chance of lasting that long, but it is more likely for Duratune's.
10.) a. z-score for 20 mph = -1.08; A car going under the speed limit would be at least 1.08 SD's below the mean.
b. A car going 34 mph would have z=2.85, or fall 2.85 SD's above the mean. For a car going 10 mph, z=-3.89. Therefore, a car going 10 mph would be more unusual because it's further from the mean.
14.) Mean = $180; SD = $24; Max = $230; IQR = $32
For Monday night, please complete the following in your textbook:
page 124: 17, 18, 19, 23 (All practice with the Normal model!)
Also, you will have a take home test over the upcoming 3 day weekend (due Tuesday, 10/15). So, if you have questions/concerns, get here after school Monday, Wednesday, or Thursday for some studying!
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