ʼn Tydskrif beweer dat die gemiddelde bedrag deur damesstudente by ʼn haarsalon spandeer R438 per besoek is. Aanvaar dat die bedrae bestee per besoek normaal verdeel is met met ʼn populasiestandaardafwyking van R105. / A magazine stated that the average amount spent by female students at a hair salon is R438 per visit. Assume that the amounts spent per visit are distributed normally with a population standard deviation of R105.

 Die waarkynlikheid dat ʼn ewekansige steekproef van 24 besoeke aan ʼn haarsalon deur damesstudente ʼn gemiddelde bedrag groter as R455 lewer is / The probability that a random sample of 24 visits to a hair salon by female students will yield an average amount spent of more than R455 is