normal distribution

Find the area under the normal distribution curve to the left of z = - 0.97. => 33.4% or 16.6% or 83.4% or 66.6%..

Find the probability P ( z < - 0.65) using the standard normal distribution. => 25.78% or 28.75% or 27.58% or 74.22%..

What is the z value so that 95% of the area under the normal distribution curve lies to the left of it? => - 1.645 or 0.13 or 1.736 or 1.645..

Find the z value so that 20% of the area under the standard normal distribution curve lies to the left of it. => - 4.772 or 4.772 or - 0.84 or 0.84..

In the standard normal distribution, what is the value of z for the 73 rd percentile? => 0.73 or 1.1 or 0.23 or 0.613..

The average length of stay in a hospital is 6.2 days. If one assumes that the number of days of hospital stay follows a normal distribution pattern with a standard deviation of 2.2 days, then what would be the maximum stay for bottom 25% of cases? => 5 days or 3 days or 4 days o..

The average annual salary in a district is $30,000. Assuming that the salaries were normally distributed for a certain group of wage earners with a standard deviation of $5,000, what is the probability that for a randomly selected sample of 70 earners the mean salary falls below..

The average age of media reporters worldwide is 35 years with a standard deviation of 6 years. If a media channel employs 50 media reporters, then what is the probability that their mean age is above 38 years? Assume that the variable is normally distributed. => 0.1% or 1% or 0...

Find the probability P (- 0.65 < z < 1.84) using the standard normal distribution. => 22.49% or 24.22% or 46.71% or 70.93%..

Suppose the number of games in which major league baseball players play during their careers is normally distributed with mean equal to 1,500 and standard deviation equal to 350 games. What percentage play in more than 2,000 games? => 7.64% or 42.36% or 0.77% or 92.36%..