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The average annual cost (including tuition, room, board, books and fees) to attend a public college takes nearly a third of the annual income of a typical family with college-age children (Money, April 2012). At private colleges, the average annual cost is equal to about 60% of the typical family's income. The following random samples show the annual cost of attending private and public colleges. Data are in thousands of dollarssignment DATA file Private Colleges 52.8 43.2 30.6 45.8 33.3 45.0 37.8 44.0 42.0 50.5 Public Colleges 20.3 - 22.0 28.2 15.6 2

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Given, Private Colleges frist 3.52.8:4312 490 33.3 44.0 30.6 usi8.37.8 50.5 42.0 Public colleges 15.6 2401 28.5 ..20.3 22.0 24&-2) - 67-8-42-5) + (43-2-4:52 + (45.0-40- + (33-3 - ५१-5) + (५५-0-42-13 + (30.6-५४.) + (45-8 - ५2.5) +31.8-425) + (50-5-५-)Standard deviation 1 2 3 4 1 2 08.-ig z(x,-F) = (2013-22-3)+(22-0–22.3) +(24.2-22.5)+ (15.6-22-3)*+ (24.-22-334 +(28-5-22-3)*The mean annual cost of attending Private and public colleges is 2012 as, C) Degree of freedom can be calculated DF = {S} /n,

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