C-05-Q053mediumsingle_mcqThe formula for the average/expected rate of return is —aR=∑R×NR = \sum R \times NR=∑R×NbR=∑RNR = \dfrac{\sum R}{N}R=N∑RcR=N∑RR = \dfrac{N}{\sum R}R=∑RNdR=∑R−NR = \sum R - NR=∑R−N