11. clayton walks his dog every day. they walk by the river five days a week, and they walk around
the block two days a week. when they walk by the river, they see other dogs 76% of the time. when
they walk around the block, they see other dogs 31% of the time.
a) draw a tree diagram to represent this situation. (2 marks)
b) determine the probability that clayton and his dog will see another dog on their next walk. (2
marks)

Tomas is making trail mix using granola and walnuts. he can spend a total of $12 on the ingredients. he buys 3 pounds of granola that costs $2.00 per pound. the walnuts cost $6 per pound. he uses the equation to represent the total cost, where x represents the number of pounds of granola and y represents the number of pounds of walnuts. he solves the equation for y, the number of pounds of walnuts he can buy. answer- b tomas added 6 to both sides of the equation instead of subtracting 6. just took the test

Needmax recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?