People suffering from Alzheimers disease often have difficul

People suffering from Alzheimer\'s disease often have difficulty performing basic activities of daily living (ADLs). In one study investigators focused on six such activities: dressing, bathing, transferring, toileting, walking, and eating. Here are data on the number of ADL impairments for each of 240 patients: Determine the relative frequencies that correspond to the given frequencies. (Round your answer to four decimal places if needed.) What proportion (p) of these patients had at most two impairments? (Round your answer to four decimal places if needed.) Use the result of Part (b) to determine what proportion of patients had more than two impairments. (Round your answer to four decimal places if needed.) What proportion of the patients had at least four impairments? (Round your answer to four decimal places if needed.)

Solution

P( x>= 4) =(23+8+12)/240 =43/240 = 0.17