Most chickens reach maturity and begin laying eggs at around 20 weeks of age. From this point forward, however, as the chicken ages,its eges its egg production decreases. A farmer was given a flock of 100 chickens (all of which were the same age) and asked to meaure daily egg output for the entire flock at random intervals starting at maturity until the chickens were 70 weeks old. The data are recorded in the scatteplot below and the line of best fit has been drawn.

How many times did the farmer's data differ by more than 5 eggs from the number of eggs predicted by the line of best fit ?

Answer

2

Explanation

Examine the graph, including the axis labels and numbering. Each vertical grid line represents 5 eggs, so look to see how many data points are more than a complete grid space away from the line of best fit. Only 2 data points meet this requirement-the first data point at about 3 weeks and the one between 30 and 35 weeks, making 2 the correct answer.