"\\def\\arraystretch{1.5}\n \\begin{array}{c:c}\n \\hdashline Type & Frequency \\\\ \\hdashline\n Am.Express & 9 \\\\\n \\hdashline\n Discover & 7 \n\\\\ \\hdashline\n MasterCard & 11 \\\\\n \\hdashline\n Visa & 23 \n\\end{array}" Check
"9+7+11+23=50" The proportion of observations in a category is called the relative frequency of the category.
"Relative \\ \\ Frequency={Frequency \\over Sum\\ of\\ all\\ frequencies}" Compute the relative frequency for each type of credit card
"\\def\\arraystretch{1.5}\n \\begin{array}{c:c: c:}\n \\hdashline Type & Frequency & Relative\\ Frequency \\\\ \\hdashline\n Am.Express & 9 & 9\/50=0.18\\\\\n \\hdashline\n Discover & 7 & 7\/50=0.14 \n\\\\ \\hdashline\n MasterCard & 11 & 11\/50=0.22 \\\\\n \\hdashline\n Visa & 23 & 23\/50=0.46\n\\end{array}" Check
"0.18+0.14+0.22+0.46=1"
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