Suppose that two different tests A and B are to be given to a student chosen at random from a certain population. Suppose that the mean score on test A is 85 with a standard deviation of 10; the mean score on test B is 90 with a standard deviation of 16; the scores on the two tests have a bivariate normal distribution; and the correlation of the two test scores is 0.8. If the student's score on test A is 80, what is the probability that their score on test B will exceed 90

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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?

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers