The mean (average) of 76, 63, 79, 63, and 74 is 71.
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The variance of 73 72 67 74 78 84 79 71 76 76 79 81 75 80 78 76 78 = 16.8456
The mean is now: (74+76+77+78+79+80+80+82+84)/9 = 78.889. Since 50 is an outlier, the overall representation of the test score becomes more accurate since the majority of values lie between 74 and 84.
9.5 is the interquartile range of those numbers.
60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
76 years. The number of years it is from 1879 to 1955 is represented by the expression 1955 - 1879, which equals 76 years.