Mikayla's supervisor has asked how long it will take for her to finish a project. Mikayla anticipates a 'best case' scenario of 4 hours, a 'worst case' scenario of 8 hours, and a 'probable' scenario of 5 hours. Using the formula to calculate 'Expected Time', Mikayla should tell her supervisor the project will take _____. 5.3 hours 6.4 hours 2.8 hours 4.7 hours 8.7 hours