(a) What is the probability that a randomly selected bag contains between 1000 and 1400 chocolate chips? (b) What is the probability that a randomly selected bag contains fewer than 1000 chocolate chips? (c) What proportion of bags contains more than 1200 chocolate chips? (dl) Who ontile ronk of o hoa that containo 1050 chocolate ching?

You may need to use the appropriate appendix table or technology to answer this question. The average number of calls received by a switchboard in a 30 minute period is 15. (Round your answers to four decimal places.)

Results from trials for a new pill for sleeping are given in this table.   slept better (B) no improvement (N) sleeping pill (S) 144 21 sugar tablet (T) 55 89 What is the probability that the subjects slept better if they took the sleeping pill = P(B|S) ?  What is the probability that the subjects took the tablet if they slept better = P(T|B)?  Give your answer as a fraction.

A committee of 4 is being formed randomly from the employees at a school: 6 administrators, 38 teachers, and 5 staff. What is the probability that all 4 members are administrators? Express your answer as a fraction in lowest terms or a decimal rounded to the nearest millionth.