By counting the number of branches we can obtain all the possible outcomes of any event. It may be drawn horizontally or vertically.
Mean is usually referred to as the average of a number of values. It is obtained by taking the sum of all the given values and then dividing by the total number of entries. It is quite simple to find the mean of the values. However the students may face a problem if there is a zero in the given data; adding a zero will not affect the value of sum but if zero is not counted as an entry huge errors may arise in the mean value. The students may also experience difficulties in accepting the result of the mean of the given numbers because the mean that is obtained may sometimes be a number from the given data and sometimes may vary from the given values; this variation can sometimes be large and sometimes be small. At this point the students face difficulty in accepting the answer. For ...Show more