In my school there are 500 students. 20% of them wear spectacles. How many students
(a) wear spectacles?
(b) do not wear spectacles?​

It is do not we're spectacles

do not wear spectacle

Step by step explanation:

20 ÷100×500= 20×5÷1= 100

therefore 100 students wear spectacles

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.