The Normal Distributions Test

Explanation
The area under a standard normal curve is 1. This is because a standard normal curve represents a normal distribution with a mean of 0 and a standard deviation of 1. The total area under the curve represents the probability of all possible outcomes, and since the total probability of all outcomes is 1, the area under the curve must also be 1.

Explanation
The correct answer is Gaussian distribution. The normal distribution is often referred to as the Gaussian distribution, named after the mathematician Carl Friedrich Gauss. It is a continuous probability distribution that is symmetrical and bell-shaped, with the majority of the data points falling near the mean. The Gaussian distribution is widely used in statistics and various fields to model and analyze random variables.

Explanation
In a normal distribution, the mean, mode, and median are all equal because the normal distribution is symmetric. The mean represents the average value, the mode represents the most frequent value, and the median represents the middle value. In a symmetric distribution like the normal distribution, these three measures of central tendency coincide and have the same value. Therefore, the statement is true.

Explanation
The shape of a normal distribution curve is dependent on the mean. The mean represents the average value of the data set and determines the center point of the distribution. It indicates where the peak of the curve will be located. A change in the mean will shift the entire curve either to the left or right, affecting the symmetry and position of the distribution. The variance, standard deviation, and mean deviation are measures of dispersion and do not directly impact the shape of the curve.

Explanation
The value of the constant e in normal distribution is 2.7183.

Explanation
In a standard normal distribution, the mode refers to the value that occurs most frequently. In this case, the mode is 0, meaning that 0 is the most common value in the distribution.

Explanation
A normal distribution is symmetric, meaning that it is evenly distributed around its mean. The mean represents the center of the distribution, and the values on either side of the mean are equal. This symmetry is a characteristic of a normal distribution, making the mean the correct answer. Covariance, standard deviation, and variance are not necessarily symmetric and do not represent the center of a distribution.

Explanation
The standard normal curve is symmetrical about the value of 0 because the mean of a standard normal distribution is 0. This means that the curve is equally likely to be above or below 0, resulting in a symmetrical shape.

Explanation
The skewness of a normal distribution is always 0. A normal distribution is symmetric, meaning it has equal amounts of data on both sides of the mean. This symmetry results in a skewness of 0. Therefore, the correct answer is 1, which represents undefined, is incorrect.

Explanation
The value of the median in a standard normal distribution is 0. In a standard normal distribution, the mean is 0 and the standard deviation is 1. The distribution is symmetric, with half of the values falling below 0 and half above 0. Therefore, the median, which represents the middle value, is 0.