The figure is showing percent of all bugs, not percent of resolved bugs. Likely the rest of the 100% is unresolved bugs.
The confusion on the second point hinges in "most likely". You're likely interpreting that as the expectation of resolution time whereas they are using maximum likelyhood estimation. MLE is rather useless in this case, but it is technically still correct.
The confusion on the second point hinges in "most likely". You're likely interpreting that as the expectation of resolution time whereas they are using maximum likelyhood estimation. MLE is rather useless in this case, but it is technically still correct.