a. Jeffrey has to suggest 60,000 dollars. b.The other jurors should use trimmed mean instead of normal mean.
Work Step by Step
a. Mean of five jurors' recommendations = 12,000 dollars Target mean of six jurors' recommendations = 20,000 dollars Jeffrey's suggestions = X $20,000 =( 12,000 * 5 + X) / 6 $ $X = 120,000 - 60,000$ $X = 60,000$ b. The other jurors should use trimmed mean instead of normal mean. This is because the extreme values or outliers will taken out to minimize their influence towards the mean.