One day, each driver entering a car park paid exactly £1.50.
the machine only accepts £1 coins and 50 p coins.
here is what was put into the machine that day.
number of £1 coins = 136
number of 50p coins = 208
on that day, what percentage of drivers paid with three 50p coins?

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .