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From a study it is known that the mean grams of hydrocarbons emitted by automobiles per mile is 1.2 grams. If a random sample of

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From a study it is known that the mean grams of hydrocarbons emitted by automobiles per mile is 1.2 grams. If a random sample of 150 automobiles is selected, a. What is the population standard deviation so that the probability of sample mean will be more than 1.24 grams is 0.35? b. Find the probability that the sample mean will be between 1.20 and 1.26 grams

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