Question

The following represent the score of 11 randomly selected STAT 201 exams: 48,59,40,38,67,78,45,56,60, 45 and 80. Construct a 90% C.I for the average score of the entire student into registration for it's centre.

Answer 1

Average = \(\frac{\text{sum}}{11}\)

\(= \frac{48 + 59 + 40 + 38 +67 + 78 + 45 + 56 + 60 + 45 + 80}{11}\)

\(= \frac{616}{11}\)

\(= 56\)