Question
A survey of 250 lobster fisherman found that they catch an average of 32 pounds of lobster per day with a standard deviation of four pounds. If a random sample of 30 lobster fisherman is selected, what is the probability that their average catch is less than 31.5 pounds?
Answers
Z = (score-mean)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
I am not understanding how to set this up. I have n=30 SD=4 xbar=250 after that I am lost
n = 30
x = 31.5
μ = 32
SEm = SD/√n
SEm = 4/√30
SEm = 0.73
z = ( x - μ ) / SEm
z = (31.5-32)/0.73
z = -0.68
P(z < -0.68) = 0.2483
Thanks Kuai that really helped me out.
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