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.)
In journal articles, the mean is usually represented by M, and the median by Mdn. Standard deviation symbols: s (the greek lower-case letter,sigma) is usually used for the population standard deviation. s is used to denote the standard deviation of a sample of scores. The formula for the standard deviation differs slightly, depending on whether it is the population s.d., the sample s.d., or the sample mean used as an estimate of the population s.d..