The estimated number of bags missing for an airline on a daily basis is a critical quality measure. Assume that customer expectation is that between 2% to 5% of the bags can be missing on any given day. Over a few days, a sample of flights were evaluated with regards to missing bags. The average % of bags missing was 2.75% and the standard deviation was 2.36%. What proportion of the total number of bags were missing that is acceptable to customers? Explain your answer and show the calculations.