In a survey at a local university, 62% of students say that they get less than the recommended eight hours of sleep per night. in a group of 4800 students, how many would you expect get eight or more hours of sleep per night?
students get eight or more hours of sleep per night?

Can any one me with the answers to these questions asap?

To prove that angle def = angle dgf by sas, what additional information is needed? def congruent to dgf dfe congruent to dfg de congruent to dg dg congruent to gf

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?