Answer
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.
