20 studentS who nad recently taken eleme statistics yielded the following Infol calculator owned. ( Texas Instruments, H SHSCS ТHTHC HSSHT стнтс (a) Estimate the true proportion of all such students who own Texas Instruments calculator. (b) Of the 5 students who owned a TI calculator, 3 had graphing calculators. Estimate the proportion of students who do not own a TI graphing calculator.

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