Consider the accompanying data on flexural strength MPa for

Consider the accompanying data on flexural strength (MPa) for concrete beams of a certain type.

Solution

(a)

We use the sample mean x-bar to estimate the polulation mean mu.

mu = x-bar/n = 218.9 / 27 = 8.1074 Answer

(b)

We use the sample median, x-bar = 7.7 (the middle observation when arranged in ascending order).

(c)

We use the sample standard deviation, s = 1.6812 Answer