The average weekly work hours of full-time U. S. workers have approximately a normal distribution with mean 37 hours and standard deviation hours. Suppose 200 U. S. citizens are randomly chosen. Find an approximate probability that less than 10 of them are working more than 50 hours a week on average (round off to third decimal place).

i think it might be a but you might want a second opinion

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."

i never knew that

step-by-step explanation: