Asample of five words was randomly selected from a 200-page book. the average number of letters of the five words was calculated. the process was repeated 10 times. the average word length of each of the 10 samples is given in the table.

what is the best estimate for the average word length in the whole book?
a) 4.07 letters
b) 4.15 letters
c) 4.38 letters
d) 4.49 letters

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

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?

We just started the introduction into circles and i have no idea how to do this.