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Posted by on Saturday, March 16, 2013 at 1:57pm.

During September, the average temperature of Laurel Lake is 64.2º and the standard deviation is 3.2º. Assume the variable is normally distributed. For a randomly selected day, find the probability that the temperature will be

a. Above 62º

b. Below 67º

c. Between 65º and 68º

  • Statistics - , Saturday, March 16, 2013 at 2:03pm

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.

  • Statistics - , Saturday, March 16, 2013 at 4:44pm

    a. .2451
    b. .8051
    c. .3897

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