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What's on the worksheet
- A hardware store's key counter keeps made-up records of X, the number of keys cut for a randomly chosen customer:
- At the final fitting of a made-to-order suit, a tailor notes how many alterations are still needed.
- A shelter's foster program keeps made-up records of X, the number of kittens in a randomly chosen litter it takes in:
- A bike courier's made-up records model X, the number of packages collected at a randomly chosen pickup stop.
- A made-up weather model gives X, the number of rainy days in a randomly chosen three-day weekend at a lake:
- Priya plays guitar for tips (busks) on Friday evenings.
- Three random variables U, V and W each take the values 1 to 5, with these probabilities:
Teach it first
The free lesson teaches it with worked examples and practice problems.
Variance and standard deviation of a random variable: the lesson ›More Chapter 4 worksheets: Probability and random variables
- 4.1The general addition rule
- 4.2Finding a conditional probability
- 4.3The general multiplication rule
- 4.4Running a simulation and estimating a probability
- 4.5Density curves: area, mean and median
- 4.6The standard normal distribution
- 4.7Normal calculations: areas and percentiles
- 4.8Random variables and probability distributions
- 4.9Cumulative probability
- 4.10Expected value
- 4.11Variance and standard deviation of a random variable
- 4.12Linear transformations of a random variable
- 4.13Combining random variables