The test scores for two algebra classes are shown in the Stem and Leaf below. Test Scores Period 9 Period 10 9 5 4 1 5 3 5 1 0 6 5 9 5 4 2 0 7 1 2 9 5 1 8 1 5 7 8 5 3 9 1 4 5 7 10 0 0 Key: |2|3 = 23% 1|2| = 21% A) How many students scored a 100%? B) How many students in 9th period scored 80% or more? C) What was the lowest score in period 10? D) Which period had more students take the test Select an answer Period 9 Period 10 ?
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
The test scores for two algebra classes are shown in the Stem and Leaf below.
| Test Scores | ||
| Period 9 | Period 10 | |
| 9 5 4 1 | 5 | 3 |
| 5 1 0 | 6 | 5 9 |
| 5 4 2 0 | 7 | 1 2 9 |
| 5 1 | 8 | 1 5 7 |
| 8 5 3 | 9 | 1 4 5 7 |
| 10 | 0 0 |
Key: |2|3 = 23%
1|2| = 21%
B) How many students in 9th period scored 80% or more?
C) What was the lowest score in period 10?
D) Which period had more students take the test Select an answer Period 9 Period 10 ?
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