Which of the following calling or caught-between hazard poses the greatest risk when working in excavations and trenches

Acompany recently announced that it would be going public. the usual suspects, morgan stanley, jpmorgan chase, and goldman sachs will be the lead underwriters. the value of the company has been estimated to range from a low of $5billion to a high of $100billion, with $45billion being the most likely value. if there is a 20% chance that the price will be at the low end, a 10% chance that the price will be at the high end, and a 70% chance that the price will be in the middle, what value should the owner expect the company to price at?