To survey a town about traffic concerns, henry divided the town into eight regions and randomly chose 10 households from each region. what type of sample did she form?

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

Rewrite the expression in z to the n power. the expression i was given is: 1 over z to the negative 1 half power.

What is the difference between –12 and –5? what is the distance between –12 and –7 on a number line? units