Question

John concludes that the probability of drawing a dime from a jar containing 40 dimes and 40 nickles is 0.5. Which experiment justifies Johns conclusion?

Answer 1

John assumed that out of 80 coins contained in the Jar, 40 coin pieces is a dime, which makes 40 out of 80 equal to 0.5. But this assumption is wrong as for each draw you'd only have 1/80 chance of getting a dime combining and giving both types of coin each a chance to be drawn.