The time that a butterfly lives after emerging from its chrysalis can be modelled by a random variable T, the model here taking the probability that a butterfly survives for more than t days as:

P(T>t) = 36/ (6+t)^2, t>=0

a. What is the probability that a butterfly will die within 5 days of emerging?
b. Calculate the mean lifetime of a butterfly after emerging from its chrysalis.

The difference between tax advoidance and tax evasion

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.

I'm confused on this could anyone me and show me what i need to do to solve it.