Given a frequency histogram of the distribution of the 100 Air Quality Index (AQI) readings collected on a given day in in Santa Roba, CA.
\table[[87,91,92,92,92,92,93,94,96,96],[%,9%,97,97,97,98,98,98,98,99],[99,99,99,99,99,100,100,101,101,101],[101,101,101,101,102,102,102,102,102,102],[102,103,103,103,103,103,103,103,104,104],[104,104,104,104-4,104,104,104,105,105,105],[105,105,105,106,106,106,106,105,106,106],[107,107,107,107,107,107,107,108,108,108],[108,109,109,109,109,109,111,111,111,111],[112,114,114,114,116,116,117,118,118,119]]
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a) What proportion of readings in the data were at most 96 ? â—»