Answer: Descriptive statistics
Explanation:
Descriptive statistic is defined as the method fro summarizing data and information to partition them into a section of meaningful data.It contains descriptive coefficients that defined the meaningfulness of the data .
Variability and central tendency are the part of descriptive statistics that describe the spread and central point of the data respectively.
Other options are incorrect because overall statistics measure complete components,average statistics take mean of complete statistic data and inferential statistic is based on random data sample.
Jimmy Carter was the 39th President of the United States from 1977 to 1981. Formerly, he had been member of Georgia Senate (1963-1967) and afterwards he became Governor of Georgia between 1971 and 1975. This previous experiencies had already trained him in leadership matters.
It ensures because it repeats over and over again.
He wrote a book "Benjamin Benneker: The Astronomer and Mathematician" And he invented America's First clock