Ringo bought a violin for $120. He spent $60 on new parts and fresh varnish before he sold it for $380 through his local newspaper. The advertisement cost $20.

a What were his total costs?

b. What was his total profit?

c. Calculate the profit as a percentage of the total cost. Write your answer to 2 decimal places.

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.