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What's on the worksheet
- At a quick-lube shop, one worker drains the old oil from a car in X minutes, with _X = 12 and _X = 1.2.
- At a rail junction, a branch-line train reaches the station X minutes after 8:00, with _X = 18 and _X = 2.6.
- A small hotel's front desk keeps made-up records for its mornings.
- Jenny runs a face-painting business.
- A jeweler strings 40 glass beads and then adds a clasp to make a necklace.
- For each pair of random variables,
- A cabinet maker fits a shelf of length X into an opening of width Y, both in millimeters.
Teach it first
The free lesson teaches it with worked examples and practice problems.
Combining random variables: 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