High Water Content Fruits. Watermelon and strawberries contain about 92 percent water per volume. Other fruits with high water content include grapefruit with 91 percent, cantaloupe with 90 percent and peaches with 88 percent water. Fruits containing 87 percent water by weight include pineapple, cranberries, orange and raspberries.
The sample variance sÂ² is the best point estimate (or single value estimate) of the population variance ÏÂ². The sample standard deviation s is commonly used as a point estimate of Ï ( even though it is a biased estimator). (Sec 6-4 showed that sÂ² is an unbiased estimator of ÏÂ², but s is a biased estimator of Ï.)
The standard deviation of a population is defined by the following formula: Ï = sqrt [ Ï (X i-X) 2 / N ]. where Ï is the population standard deviation, X is the population mean, X i is the i th element from the population, and N is the number of elements in the population.The standard deviation of a sample is defined by slightly different formula: s = sqrt [ Ï (x i-x) 2 / (n - 1) ].where s is the sample standard deviation, x is the sample mean, x i is the i th element from the sample, and n is the number of elements in the sample. And finally, the standard deviation is equal to the square root of the variance.here Ï is the population standard deviation, X is the population mean, X i is the i th element from the population, and N is the number of elements in the population. The standard deviation of a sample is defined by slightly different formula: s = sqrt [ Ï (x i-x) 2 / (n - 1) ].