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Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.

Tell whether the two rates form a proportion