15+21b Please help me, i suck at math

Step-by-step explanation:

okay so i’m not 100% sure on how to do this but i think you can just add the two together? like 15 + 21 + b. like that’s be 36b. so i’m not sure if that’s how you do it but i think you can do it that way?

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.

these sign is used to tell weather the number is greater or less than the number   <   or >     but this sign means its equal =    

hope this you and

step-by-step explanation: