Statistics

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A survey of 250 lobster fishermen found that they catch an average of 32.0 pounds of lobster per day with a standard deviation of 4.0 pounds. If a random sample of 36 lobster fishermen is selected, what is the probability that their average catch is less than 31.5 pounds? Assume the distribution of the weights of lobster is normal.

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  1. If 32 is the average, and the standard deviation is 4, then 31.5 is very very close to the mean.
    Use your z-score to find the value to look up : )
    z= (x-average)/standard deviation

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