2. A sample set of scores are 23,48,49,55,57,63 and 72. (a)find the sample mean and sample standard deviation. (b)find the outliers using 1.5IQR rule.

3. Eight numbers have a mean of 16. Given that the first seven numbers have a total of 130, determine the value of the eighth number.

4. The windspeeds at 10 coastal locations have mean 25 knots and sample stan- dard deviation 4 knots.The windspeeds at 20 inland locations have mean 20 knots and sample standard deviation 5 knots. Calculate the mean and sample standard deviation of the combined set of 30 windspeeds.