Final answer:
Without the actual histogram or additional data, it's not possible to determine an accurate estimate for the number of female members who are over 50 years old in the social club.
Step-by-step explanation:
The provided histogram and the statement indicate that we need to estimate the number of female members who are over 50 years of age in a social club. To find this, we must first know the total number of members over 50. However, this specific number is not provided in the information given. Once we have the total number of members over 50, we can then calculate 80% of that figure, since we are told that 80% of the members over 50 years old are female. Without the actual histogram or additional data, we cannot determine an accurate estimate for the number of female members who are over 50. Therefore, we are unable to answer part a of this question with the information currently available to us.