So far, two-thirds of the seniors bought prom tickets. If they need a minimum of 250 people to attend in order keep the venue, how many students must be in the senior dass to ensure they sold enough tickets?

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?