Bernice wants to know which ice cream parlor is the most popular among students at her school. which samples are random for this population and which are not?

four people from each of bernice's classes
every sixth person at bernice's favorite ice cream parlor
every third girl that walks by the school cafeteria
two people from every class during fourth period at bernice's school
every fifth person that walks by the school library

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? 8,000 + 24x 8,000 − 24x 8,000 + 2x 8,000 − 2x

Two lines parallel to a third line are parallel to each other. always sometimes or never

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?