ADDSC		IQ
	35-39	5	70-79	1
	40-44	3	80-89	8
	45-49	8	90-99	7
	50-54	3	100-109	9
	55-59	7	110-119	1
	60-64	3	120-129	4
	65-69	1	130-139	2
	70-74	2

ADDSC, and IQ have been chosen to calculate the three measures of central tendencymean, median, and mode. when should these be used and identify the advantages and disadvantages of each?

How do I calculate the variance and standard deviation in the ADDSC? Explain how variability can help me understand data.