Consecutive triangular numbers
Use inductive reasoning to answer. If you add two consecutive triangular numbers, what kind of figurate number do you get?
A. a pentagonal number
B. a hexagonal number
C. the next traingular number
D. a square number
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What differentiates ratio data from data that are only interval?
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For the final days before the election, the campaign manager has a total of $34,000 to spend on TV and radio campaign advertisements. Each TV ad costs $3000 and is seen by 10,000 voters, while each radio ad costs $500 and is heard by 2000 voters.
A test for breast cancer correctly classifies 95% of malignant tumours as malignant but also incorrectly classifies 1% of benign tumours as malignant. It is thought that approximately 5% of samples submitted for this test are taken from malignant
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Find & interpret the probability that exactly 8 of them started smoking before 21 years of age. Find & interpret the probability that fewer than 8 of them started smoking before 21 years of age.
What is the range width of the actual number of people present at the Station at any given moment? (For concreteness, assume the fluctuations do not exceed one sigma.)
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