There are 30 students in Mrs. Jones class. 20% of the students received an A on the last math test. How many students received an A?

20% of 30

= 20/100 * 30

= 6

hence 6 students recieved A grade

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.