Internal Revenue Services (IRS) selects taxpayer files for audit if their profile matches certain criteria. The Following sample is taken from taxpayers who were audited for tax year 2012:

Frequency	Taxable Income($1000s)
6	20 to under 40
5	40 to under 60
16	60 to under 80
21	80 to under 100
23	100 to under 120
17	120 to under 140
9	140 to under 160
8	160 to under 180

1. What is the cumulative relative frequency of taxpayers who were audited and their taxable income was less than $100,000?
   1. 0.21
   2. 0.46
   3. 0.64
   4. 0.86

1. What was the approximate average taxable income of taxpayers in this sample?
   1. $89,500
   2. $96,600
   3. $103,714
   4. $112,600

1. What is the approximate standard deviation of taxable income in this sample, rounded to nearest dollar?
   1. 27,819
   2. 28,350
   3. 32,821
   4. 36,195