Question

Television viewing reached a new high when the Nielsen Company reported a mean daily viewing time of 8.35 hours per household (USA Today). Use a normal probability distribution with a standard deviation of 2.5 hours to answer the following questions about daily television viewing per household.

Question 1: What is the probability that a household views television between 5 and 10 hours a day?

Question 2: What is the probability that a household views television for less than 8 hours?

Lori Jeffery is a successful sales representative for a major publisher of college textbooks. Historically, Lori obtains a book adoption on 25% of her sales calls. Viewing her sales calls for one month as a sample of all possible sales calls assume that a statistical analysis of the data yields a standard error of the proportion of 0.0625

Question 3: What is the probability that Lori will obtain book adoptions on 40% or more of her sales calls during a one-month period?

How do I input the equations into excel and get the answers to these questions?

Answer 1

Here it is given that distribution is normal with mean=8.35 and standard deviation=2.5

1. Here we need to find

As distribution is normal we can convert x to z

2. Here we need to find

3. Here we need to find

As let us assume distribution is normal we can convert p to z