Hypothesis and conclusion if you like math then I’m you like science

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?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?