The price of a computer was decreased by 20% to £420. What was the price before the decrease?
£ 1

Select the graph of the solution. click until the correct graph appears. |x| = 3

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

Why is causation so much more difficult to prove than correlation?