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00:00Hi kids! In our last lesson, we learned the different types of averages, mean, mode,
00:08median, and range. Today, we will learn how we can solve questions based on these
00:15types of averages. So let's get started. Alan got the following scores in his
00:235 tests. Now what is his average score? We know we find average by adding up all
00:33the scores and divide it by the number of scores. Adding up all the scores, we
00:40will get 395. And how many subjects are there? There are 5. So divide 395 by 5
00:53and we get 79. So average score for Alan is 79. Now let's move to another question.
01:05John got the following scores in his 4 tests. What should be John's minimum
01:13score in his 5th test to get average of 80 in all 5 tests? Let's solve the
01:21question. We want average 80 for 5 tests. That is, in all tests, it should be 80
01:30marks. It means 80 multiplied by 5 must be equal to 400. 400 should be the total
01:41for 5 tests. And John got 315 marks in 4 tests. So John needs 400 minus 315, which
01:55is equal to 85. 85 marks in his 5th test if he wants his average to be 80. And if
02:06the total is 400, the average score is 80. Now let's take another example.
02:14Average temperature from Sunday to Friday is 15 degrees Celsius. Then can we
02:22calculate the temperature on Friday at its missing? Let's calculate. We know the
02:29average temperature from Sunday to Friday is 15 degrees Celsius. That means
02:3615 multiplied by 6 is 90. 90 is the sum of the temperature from Sunday to Friday.
02:45And the sum of temperature from Sunday to Thursday is 77. So the 6th temperature
02:55recording we need is 90 minus 77 equals 13, as the total should be 90. And the
03:06average we know is 15 degrees Celsius. Temperature on Friday was 13 degrees
03:14Celsius. Weight of the students in grade 5 in pounds is given. We have to find
03:21mean, mode, median, and range for these lists of numbers. Let's solve the
03:28question. First of all, let's find out the mean. We know mean is average, so mean is
03:37adding all this number and divided by 6, as total number of students are 6. Adding
03:45all the numbers, we will get 350. And dividing 350 by 6, we will get 58.33. So
03:57mean is 58.33. Now let's find what is mode. Mode is the most common value in
04:07this list of number. No value is getting repeated, so there is no mode for this
04:16list of numbers. Now let's find the median. As we know, it is the middle value in the
04:25list of ordered numbers. So first arrange the number in an order. Now let's find
04:32the middle value. Cutting a value each from left and right side at the same
04:38time, and repeating this procedure till we are left with one or two numbers in
04:45the center. And we are left with two middle values, 56 and 67. So in order to
04:55find the median, we will find the mean of these two numbers, that is add these
05:03two numbers and divide by 2. 56 plus 67, we get 123. And dividing them by 2, we
05:16get 61.5. So 61.5 is the median. Now let's find out what is the range. We know range
05:30is a difference between the biggest and smallest value. Biggest value here is 78,
05:36and smallest one is 34. 78 minus 34, we will get 44. So range of the list of values is 44.
05:49So kids, now we are fully aware what is average, and types of average, mean,
05:57mode, median, and range. Now you may go ahead and take a quiz to learn more. Bye bye!