mean deviation for discrete series

The distances traveled in kilometers by a person on four different days is: 63, 42, 55, 40. Find the mean distance and standard deviation. => Mean = 54, standard deviation = 9.5 or Mean = 54, standard deviation = 6.3 or Mean = 50..

Let X denote the number of scores on a test. If X is normally distributed with a mean of 90 and a standard deviation of 10, find the probability that X is not less than 70. => 0.4772 or 0.7472 or 0.7972 or 0.9772..

The scores made by candidates in a certain test are normally distributed with mean 500 and standard deviation 100. What is the percentage of candidates who scored less than 400? => 15.87% or 17.85% or 18.57% or 15.78%..

The scores made by candidates in a certain test are normally distributed with mean 500 and standard deviation 100. What percentage of candidates received scores which differ from 500 by more than 150 points? => 43.23% or 13.36% or 43.32% or 6.68%..

The number of stamps of different countries collected by Edward are 96, 98, 98, 105, 36, 87, 95 and 93. Find the mean and the standard deviation. => 416.25, 20.4 or 88.5, 20.4 or 20.4, 5.77 or 20.4, 4.51..

Based on a study, the mean family income in the US was $38,000 with a standard deviation of 21,000. If a consulting agency surveys 49 families at random, what is the probability that it finds a mean family income of more than $41,500? => 1.21% or 12.1% or 98.79% or 87...

The number of ATM transactions of a bank per day were recorded at 12 locations in a city. The mean of the sample was 88.5 transactions, with a sample standard deviation of 42. Find the 98% confidence interval of the true mean. => 19.06 < μ < 157.94 or 78.99 &l..

. The first natural series to be discovered is uranium - 238 series. It involves fourteen separate steps, eight of which involve a - emission whereas six involve b - emission. The overall process is written ..

Summary - (i) Let X be a set of numbers and f : N n X be a function, then the ordered set {f(1), f(2),...., f(n)} is called a finite sequence in X. (ii) Let X be a set of numbers and f : N X be a function, then the ordered set {f(1), f(2),....} is called an infinite sequence in X. If {T n } is a se..

Which of the following controls the spread of normal curve? I. standard deviation II. mean III. median IV. mode => III and IV only or II only or III only or I only..