A medical researcher is interested in determining if there is a relationship between adults over 50 who walk regularly and low, moderate, and high blood pressure. A random sample of 236 adults over 50 is selected and the results are given below:
70.8, 27.1, 66.2, 20.8
Find the expected frequency E2,2 to test the claim that walking and low, moderate, and high blood pressure are not related.