Over the last 80 years records have been kept of the annual rainfall in the Tasmanian desert. The distribution of annual rainfall is approximately normal and has no outliers. The minimum of 2.5 inches of rain occurred in 1959; the maximum of 9.7 inches of rain occurred in 1938.
Two years ago, the annual rainfall was 7.3 inches. The standardized value corresponding to this rainfall is approximately
◦ -0.5.
◦ 0.5.
◦ 0.
◦ 1.
◦ none of these