The following data are the marks for a sample of 5 students in Mathematics Exam. 18, 10, 20, 22, 28 Find a point estimate for the mean marks. O19.6 O18.4 O18 O20 Find a point estimate for the standard deviation of the marks. 04.56 04.74 06.28 06.54 Construct a 99% confidence interval for the mean marks to estimate the mean of all students in the class. (9.01, 27.79) (8.24, 27.76) (6.13, 33.07) (7.07, 32.93)

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