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The histogram is symmetrical

Q: This distribution of data shows lots of lifetime averages in the middle classes but tails off sharply at both the upper and lower ends What best explains the fact that there are very few averages in?

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It plots people on a "normal distribution" where the majority are in the middle, usually corresponding to a C/C+ and there are fewer people as you go out towards the ends (B's and A's, or D's and F's). Essentially, if people don't naturally fall on a normal distribution it artificially fits them onto one and shifts their grades up or down. It's based upon an assumption that the majority of people are and should be graded as mediocre and fewer should fall to either side. In practice though there is often such diversity in averages due to a host of different variables/conditinos, even among very large classes/schools/districts, that this approach tends to artificially inflate or deflate grades.

5 classes

It was divided into FOUR classes: Zoroastrian priests, warriors, secretaries and commoners.

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there are eight classes in wizard 101: Fire, Ice, Life, Myth, Storm, Balance, Death, and Astral.

Related questions

The averages of a class may depend on two criteria. If it is norm referenced criteria then there is a distribution according to a bell curve. If it is criterion referenced then it would have a distribution set to what the knowledge learned and compared to the objectives of the class. Secondly, the students who sign up for a class, especially criterion referenced, may be students well suited for the tasks required to make the grades.

Is it likely that the final abundance distribution among the age classes will be similar

No it is not. The ogive is a graph that represents the cumulative frequencies for the classes in a frequency distribution.

Because engineers are smart and they enjoy their subjects

It is simply a distribution which has two modal classes: you cannot convert two of them into a mode.

They are both modal classes - the distribution is bi-modal.

The 2k or 2 to K rule is used to determine the number of classes for a frequency distribution. The 2k rule should be used as a guide more than a dictator of determining the number of classes for a frequency distribution.

There are three broad classes of irrigation systems: Pressurized distribution Gravity flow distribution Drainage flow distribution

frequency distribution

4

If, in a frequency distribution, the initial class interval is indeterminate at its beginning and/or the final class interval is indeterminate at its end, the distribution is said to possess "open ended" classes.

to avoid a large number of empty classes?