normal distribution curve

Find the area under the normal distribution curve shown in the figure. => 15.59% or 9.01% or 84.41% or 94.41%..

How many modes does a normal distribution curve have? => zero or more than two or one or two..

Write the percentage of the area shaded in the normally distributed curve shown. => 4.7% or 2.35% or 95% or 99.7%..

Find the highest control limit for a normally distributed curve with a mean of 20 and a standard deviation of 3. => 23 or 29 or 11 or 26..

Which of the following represents a normal (symmetric) distribution curve? I. Graph 1 II. Graph 2 III. Graph 3 => I only or II only or I and II only or II and III only..

The lifetime of an electronic toy is observed as normally distributed curve with a mean of 300 hours and a standard deviation of 180 hours. What is the probability that a randomly selected toy will last for 300 to 480 hours? => 480 or 300 or 0.68 or 0.34..

What is the area under the normal distribution curve to the left of z = 1.56? => 94.06% or 5.94% or 55.94% or 44.96%..

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 z value so that 75% of the area under the standard normal distribution curve lies to the right of it. => - 0.674 or - 0.25 or 0.674 or 0.25..

Find the area under the normal distribution curve between z = 0 and z = 1.56. => - 40.64% or 46.04% or - 46.04% or 44.06%..