A purchasing manager at a university is investigating which brand of LCD projector to purchase to equip "smart" classrooms. Of interest to her is the variability of the lifetime of the light bulbs used in the projectors. One company has published the following information regarding the lifetimes of a sample of so bulbs used in its LCD projectors: Frequency 20 IS 154 104 700 750 Bulb lifetime (in hours) s00 900 950 Based on this histogram, estimate the standard deviation of the sample of so lifetimes. 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.)

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A: Given: Mean, μ=448 Standard deviation, σ=21 Using standard normal table: P (Z>z)=14%1-P…

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A: The answer is attached below,

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A: