Use the following information to answer questions 4-6: 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) 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 4) What is the cumulative relative frequency of taxpayers who were audited and their taxable income was less than $100,000? A. 0.21 B. 0.46 C. 0.64 D. 0.86 5) What was the approximate average taxable income of taxpayers in this sample? A. $89,500 B. $96,600 C. $103,714 D. $112,600 6) What is the approximate standard deviation of taxable income in this sample, rounded to nearest dollar? A. 27,819 B. 28,350 C. 32,821 D. 36,195