Laura Strubel is reviewing some data from a marketing research report she obtained that shows the age of persons who frequently purchase her company's product, Strubel's Gourmet Seafood frozen dinners. Laura is considering buying radio time for a new ad campaign, and knowing the age of the target market would be very helpful to her in selecting which stations should run the ads. Laura sees that the mean age of frequent buyers is 45 with a standard deviation of 12. She correctly interprets this to mean that 68 percent of her target market fall between the ages of:
A) 39 to 51
B) 45 to 68
C) 33 to 57
D) 33 to 56
E) 45 to 57

Question

Quizplus · Accepted Answer

Since the mean age is 45 and the standard deviation is 12, we know that 68% of the frequent buyers fall within one standard deviation of the mean, which is between 33 and 57 (45-12=33 and 45+12=57). Therefore, the correct answer is C: 33 to 57. None of the other choices include this range.

Laura Strubel Is Reviewing Some Data from a Marketing Research