The distribution of the amount of money spent by first-time gamblers at a major casino in Las Vegas is approximately normal in shape with a mean of $600 and a standard deviation of $120. According to the standard deviation rule, almost 84% of gamblers spend more than what amount of money at this casino?

amount of money = 480

Explanation:

given data

mean = $600

standard deviation SD = $120

amblers spend = 84%

solution

As here 84% values fall within ±1 SD of mean

so here 16% above = mean + 1 * SD

and 16% below = mean - 1 * SD

so by standard deviation rule

about 84% more than = mean - 1 * SD

so here

amount of money = mean - 1 * SD

amount of money = 600 - 1 * 120

amount of money = 480