Data Presentation and Interpretation

State the skewness of these data [2]

• Positive

• Negative

Answer in 3 s.f. [3]

[1]

[1]

• Decrease

• Stay the same

• Increase

Calculate the mean (in minutes) for these data. Answer in 3 s.f. [1]

Calculate the standard deviation (in minutes) for these data. Answer in 3 s.f. [2]

Find the mean of x. Answer in 3 s.f. [2]

Find the standard deviation of x. Answer in 3 s.f. [2]

Find the value of a [1]

Find the value of b [1]