The principal of a high school needs to plan seating for commencement. The following two-way table displays data for the students who are involved in this year's commencement ceremony. Grade level In choir Not in choir TOTAL
Junior 151515 333 181818
Senior 232323 436436436 459459459
Other 333 000 333
TOTAL 414141 439439439 480480480
For these students, are the events "senior" and "not in choir" mutually exclusive?
Choose 1

20 solve 2(4 x + 3) < 5 x + 21. a) { x | x < 9} b) { x | x > -5} c) { x | x > -9} d) { x | x < 5}

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?

I’m really confused and need to learn this