The mean of a national test is known to be 275 with a standard deviation of 7.  A group of 10 students had the following scores on the test: 260, 258, 277, 290, 254, 268, 270, 242, 265, and 272.   Find μ and x ̅.  a μ = 265.6 and x ̅ = 275  b μ = 275 and x ̅ = 7  c μ = 7 and x ̅ = 265.6  d μ = 275 and x ̅ = 265.6

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