Normal probability distribution The number of personal messages sent by the workers data on a daily basis at a certain company is typically distributed, with a mean of 150 and a standard deviation of 50. a. How many of 45 randomly selected workers have a personal messaging frequency less than 170? What is the probability that: b. Randomly selected workers from this company have a daily personal messaging frequency greater than 140? c. A randomly selected worker from this company has a daily personal messaging frequency between 140 and 180?

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