Answer to Question #63865 in Statistics and Probability for Mage

Question

A group of students has measured the heights of 90 trees. The class calculate the mean
height to be x = 12.4 m with standard deviation s = 5.35 m. One student notices that
two of the measurements, 44.5 m and 43.2 m, are much too big and must be wrong.
(a) How many standard deviations away from the mean of 12.4 is the value
44.5?(3m
arks)
191
The incorrect measurements of 44.5 m and 43.2 m must be removed from the data.
(b) Calculate the new value of x after removing the two unwanted values.