sat test scores what do they mean

A talent test has a mean of 220 and a standard deviation of 10. Which among the following statement(s) is/are true? I. If the z score for an exam score is negative, then the score is less than 220. II. If the z score for an exam score..

The scores of 10 students in Jim's class are 62, 57, 61, 58, 63, 64, 64, 64, 59 and 74. Find the mean of the scores of the students. => 63.6 or 64.6 or 61.6 or 62.6..

Find the z scores of three students who had a score of 93, 80, 84 in an examination for a pre-medicine course which has a mean of 84 and a standard deviation of 4. => 9, - 4, 0 or 23.25, 20, 21 or 2.25, - 1, 0 or - 2.25, 1, 0..

Dennis has taken an aptitude test 8 times and his scores are 96, 98, 98, 105, 36, 87, 95 and 93. Is mean or median the better measure of central tendency? => Mean or Median..

In a NBA playoff season the average number of points scored in a game was 200. Assume the standard deviation was 75. If a random sample of 20 games is selected, then what is the probability that the mean of the sample is lesser than 220? => 17.20% or 33.80% or 67.20% o..

If two samples have means of 30 and 28 and variances of 12 and 14, with 20 and 25 as the sizes, find the z score for difference of two population means. => 2.154 or 2.075 or 2.320 or 1.857..

In the 8 th grade there are 3 teams A, B, and C having 28, 35 and 37 students respectively. The mean score of Team A is 60%, of Team B is 70% and of Team C is 85%. Find the mean score of the entire 8th grade. => 75.75 or 72.75 or 71.66 or 33.33..

Mean - Mean is the arithmetic avera..

Pollution can be anything - which damages the ecosystem and destroys the delicate balance in the ecosystem. Thereby, it creates health hazards to human beings and animals besides damaging the ecosystem. For e.g., industries polluting air has set imbalance in composition of air and made it unworthy ..

Separation of petroleum into simpler fractions after the removal of unwanted material..