The bacteria starts at 2million. the doctor prescribes an antibiotic that reduces the bacteria population to 1/4 of its size each day.
a. draw the graph of the size of the bacteria population against time in days.
b. find the formula that gives the size of the bacteria population in terms of time.
c. find the size of the bacteria population ten days after the drug was first taken.
d. find the size of the bacteria population after 14 days

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?