Distributions Statistics

Approximately what percent of the Earth’s water is salt water?

• 97%

• 71%

• 1%

• 3%

Tags

NGSS.MS-ESS2-4

The graphic shows that only 3% of the Earth's water is fresh water. The graphic also shows that of this 3%, almost all of it is contained in two reservoirs. What are the two reservoirs that contain almost all of Earth's fresh water?

• glaciers and groundwater

• streams and estuaries

• marshes and swamps

• lakes and rivers

Tags

NGSS.MS-ESS2-4

The diagram shows the distribution of water on the Earth. Which source is the most abundant supply of liquid surface water that is not salty?

• groundwater

• oceans

• lakes

• rivers

Tags

NGSS.MS-ESS2-4

What is the mean of a normal distribution?

• The peak of the distribution

• The spread of the distribution

• The average value of the distribution

• The skewness of the distribution

Which of the following distributions is used to model the number of successes in a fixed number of independent Bernoulli trials?

• Normal distribution

• Poisson distribution

• Binomial distribution

• Exponential distribution

In a normal distribution, what percentage of data falls within one standard deviation of the mean?

• 50%

• 68%

• 95%

• 99.7%

What is the primary characteristic of a Poisson distribution?

• It models continuous data

• It models the time between events

• It models the number of events in a fixed interval

• It models the probability of success in a trial

Which distribution is characterized by a single peak and symmetric shape?

• Uniform distribution

• Normal distribution

• Exponential distribution

• Binomial distribution

What is the variance of a standard normal distribution?

• 0

• 1

• 2

• 3

Which distribution is used to model the time until an event occurs?

• Normal distribution

• Exponential distribution

• Binomial distribution

• Poisson distribution