hi mgmat staff,
could you please clarify this :
moody's and S&P question - Q3:
question #2: In a group of 540 corporate bonds, 25% of which are rated BBB and 75% of which are rated BB (both by S&P), the approximate number of bonds expected to default is 135
text from mgmat explanation: "The remaining bonds (540 - 135 = 405) are rated BB by S&P, with a 30% default rate, so 30% of 405"
my question: how can we approximate the default rate for BB to 30%. if you take a straight line on the x axis from BB on the corporate rate graph, BB defaults to 20% and NOT 30%, am I wrong in interpreting the graphical content ? please clarify how is the default rate for BB 30%.
Thanks in advance!