The average retail price of gasoline (alltypes) for the first half of 2005 was 212.2 cents. What would the standard deviation have to be in order for a 15% probability that a gallon of gas costs less than $ 1.80?

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Q: (g) P(-1.70 sz≤ 2.00) 3 2 (h) P(1.46 ≤ Z ≤ 2.50) (1) P(1.70 s2) (1) P(IZI ≤ 2.50)

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Q: (c) P(-2.70 ≤ Z≤ 0) (d) P(-2.70 ≤ Z ≤ 2.70) (e) P(Z ≤ 1.46) (F) P(-1.65 ≤ 2)

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