Variability in cooking time using microwave ovens is of concern to food processors. The Oppenlicht Popcorn Company is considering a new formulation for its microwave popcorn, and the company will change over to this new formulation if the variability in cooking time is less than that of its current formulation, A production test run is performed using the new formulation. The newly formulated popcorn is cooked in 20 randomly selected microwave ovens, and for each the cooking time is measured (in seconds). Oppenlicht staff reports the results to company executives via the following histogram: Frequency 10- 6. 5- 4. 110 120 130 140 150 Cooking time (in seconds) Based on this histogram, estimate the standard deviation of the sample of 20 cooking times. Carry your intermediate computations to at least four decimal places, and round your answer to at least one decimal place. (If necessary, consult a list of formulas.) D.

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