If a sample of 132 customers were taken from a population of 2340 customers s2 could refer to the variance of how many of the customers' ages?

With finding limits of multi variable !

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6