1
39 63 wind speed (km h )
–1
Measurements of wind speed on a certain island were taken over a period of one year. A box-andwhisker
plot of the data obtained is displayed above, and the values of the quartiles are as shown.
It is suggested that wind speed can be modelled approximately by a normal distribution with mean
µ km h−1
and standard deviation σ km h−1
.
(i) Estimate the value of µ. [1]
(ii) Estimate the value of σ. [
1 answer
u = (63+39)/2=51
1 answer