Roman has a certain amount of money. If he spends $15, then he has 1/4 of the original amount left. How much money did Roman have originally

$20

Step-by-step explanation:

He spent $15 and now has 1/4 of what he had.

When he had $20, he had 4/4.

15=3/4

10=2/4

etc..

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.

the answer is c

hope this !