Openstax.org/EPSO Topic 5 SDC Statistics

The number of books in a backpack is an example of what type of variable?

• discrete

• continuous

The weight of the books in a backpack is an example of what type of variable?

• discrete

• continuous

When dealing with continuous random variables, what is P(x=7)?

• 0

• 1

• 7

If P(x < 5) = 0.35

what is P(x > 5)

• -0.35

• 0.53

• 0.65

• 1

• Normal;

  Bell curve

• Uniform;

  Rectangle

• Fractional;

  Ellipse

• Quadratic;

  Parabola

If continuous random variables follow a uniform distribution, and all values are between 0 and 20, what would be the function to describe the distribution?

• 4.0

• 0.4

• 1.0

• 0.10

According to the World Health Organization, distribution of the height in centimeters of 5 year old girls follows a normal distribution such that X ~ N(109,4.5).

What would be the z-score of a girl that is 112 cm tall?

• 0.13

• 0.45

• 0.67

• 0.97

According to the World Health Organization, distribution of the height in centimeters of 5 year old girls follows a normal distribution such that X ~ N(109,4.5).

What would be the z-score of a girl that is 100 cm tall?

• -0.92

• 2

• 0.92

• -2.0

According to the World Health Organization, distribution of the height in centimeters of 5 year old girls follows a normal distribution such that X ~ N(109,4.5).

What would be a girl's height if she had a z-score of 1.5?

• 102.25

• 110.5

• 113.5 cm

• 115.75 cm