C.Friction
This force develops only when two surfaces are in contact
Answer: Mean Central Tendency
Explanation:
Central tendency means the measures in which we use in finding the average value of a statistical series of quantitative data.The mean gives the arithmetic average of a group of scores that is the scores from a data are totaled and divided by the number of scores. Mean as a measure for central tendency is easy to understand, calculate and utilizes all scores of a distribution, However, it tends to be affected by extreme scores giving absurd negative values for example, a couple of extremely low scores can skew the mean so that the average score appears much more lower than most of the scores actually are.
Here, Even though students work hard and do well for most of the grading period, sometimes students get overwhelmed and do poorly on one test, which affects their overall grades-->this is because mean central tendency can give negative absurd values for extreme scores ( in this case, low scores ) in its observation, affecting a student's overall grade.
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-books
-Japanese who traveled to China
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"the policies of William the conquer, king of England from 1066 until his death in 1087, may be largely responsible for eventually making Britain the most powerful nation in Europe."
