Question

#5 A study of adult cell phone owners found that their annual income was normally distributed with a mean of $41,200 and a standard deviation of $18500. If sellers of cell phones wish to target the adult owners of cell phones whose incomes are in the top 83%. What is the minimum income level for the top 83% of the group?

#4 The heights of high-school students are normally distributed with a mean of μ = 62.5 inches and standard deviation of σ = 5.9 inches. Find the probability that a randomly selected student will be between 57.4 inches and 67.6 inches tall.

#3 If the population mean, μ = 35 and the population standard deviation σ = 15, what percentage of data values fall between 20 and 65?

#1 In the accompanying table, x represents the number of children under 18 that are in families. Is this a probability distribution? Explain why or why not.

x	P(x)
0	0.48
1	0.21
2	0.19
3	0.08

Answer 1