Charles Clayton monitors the daily performance of his investment portfolio by recording a "+" or a "-" sign to indicate whether the portfolio's value increased or decreased from the previous day.His record for the last eighteen business days is "- + + - - - + - - + + + - + + + + -".The number of runs in this sample is _________.
A)uncertain
B)four
C)five
D)nine
E)one

Question

Quizplus · Accepted Answer

A run is a sequence of identical elements (in this case, "+" or "-") that is followed by a different element or no element at all. In the given sequence, there are nine runs: "- + + - - - + - - + + + - + + + + -".

Charles Clayton Monitors the Daily Performance of His Investment Portfolio