Asmall company involved in e-commerce is interested in statistics concerning the use of e-mail. a poll found that 39% of a random sample of 1127 adults, who use a computer at their home, work, or school, said they do not send or receive e-mail.

(a) find the margin of error for this poll if we want 99% confidence in our estimate of the percent of american adults who do not use e-mail. (round to three decimal places as needed.)
(b) explain what that margin of error means.
(c) if we want to be 90% confident, will the margin of error be larger or smaller? find that margin of error. (round to three decimal places as needed.)
(d) in general, if all other aspects of the situation remain the same, will smaller margins of error involve greater or less confidence in the interval?

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?

Aking and his army will attempt to capture a fortress. the left and right flanks break off from the main group to attack the west and east guard towers. suppose the left flank has a 60% chance of success and the right flank has a 75% chance of success, independently of one another. if both flanks capture their respective targets, then the king has a 98% chance of successfully taking the fort. if, however, only the left flank captures its tower, the king has an 80% chance of success; if only the right flank succeeds, the king has a 50% chance. if both flanks fail, then the king's chance of capturing the fort drops to 20%. it turns out the king captures the fort. what is the probability that one, and only one, flank was successful (either the left, or the right, but not both)? (round your answer to 3 decimal places)