Brian is interested in keeping track of the battery life of his laptops. the average battery life he recorded is 48%. if the sum of his battery lives are 288%, what is the total number of laptops he owns?

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?

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

At oaknoll school, 90 out of 270 students on computers. what percent of students at oak knoll school do not own computers? round the nearest tenth of a percent.