A normal distribution is defined by two parameters: the mean, m, and the variance s2, (or standard deviation, s).
The standard normal distribution is the special case of the normal distribution in which m = 0 and s = 1.
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The difference between abstract and summary is that an abstract is a short from of a summary.
110.All the 500s start with a 5 so that is 100 numbers that start (or end) with a 5.Of the 400s, only those which ends with a 5 will do which are 405, 451, ..., 495. ie once for each possible tens digit; the tens digit can be one of 0, 1, ..., 9, ie one of 10 values, so there are a further 10 numbers that (start or) end with a 5.making 100 + 10 = 110 numbers in all.