Use the data dictionary to find the variable that measures how many hours the respondent usually works per week. Assume a normal probability distribution for the population. Ignoring any non-responses and responses of hours that may vary, what is the probability that any person in the sample usually works 20 hours or less. Type the answer as a probability or as a percentage (without the % sign).

NOTE: Using a filter and then calculating the probability from the filtered data will NOT effectively remove the filtered cases from the probability calculation. It will still calculate the probability from the full variable. I would suggest trying a different method for ignoring specific cases.