Probability & Statistics

timer Asked: Jan 20th, 2015

Question description

In a standardized IQ test, score were normally distributed, with a mean of 110 and a standard deviation of 18. Draw the normal curve, label and shade the area for each question. 

a. Find the probability that a randomly selected Person has an IQ score greater then 125. Write your answer with four decimal places

b. Find the probability that a randomly selected person has an IQ score between 90 and 121. write your answer with four decimal places 

c. A random sample of 64 people is selected from this population. what is the probability that the mean IQ score of the sample is less than 115? write your answer with four decimal places 

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