Advertisements
Advertisements
प्रश्न
The mean of three numbers is 10. The mean of other four numbers is 12. Find the mean of all the numbers.
Advertisements
उत्तर
Mean of three numbers = `"Sum of three numbers"/3`
⇒ `10 = "Sum of three numbers"/3` ...[∵ Mean of three numbers = 10, given]
Here, sum of three numbers = 30
Mean of other four numbers = `"Sum of other four numbers"/4`
⇒ `12 = "Sum of other four numbers"/4` ...`[(∵ "Mean of other four"),("numbers" = 12"," "given")]`
Hence, sum of other four numbers = 48
∴ Mean of all the numbers = `"Sum of all the numbers"/"Total numbers"`
= `(["Sum of first three numbers" + "Sum of other four numbers"])/7`
= `(30 + 48)/7`
= `78/7`
= 11.14
Hence, mean of all the numbers is 11.14.
APPEARS IN
संबंधित प्रश्न
The calculated mean of 50 observations was 80. It was later discovered that observation 19 was recorded by mistake as 91. What was the correct mean?
The number of Science and Mathematics projects submitted by Model high school, Nandpur in last 20 years at the state level science exibition is:
2, 3, 4, 1, 2, 3, 1, 5, 4, 2, 3, 1, 3, 5, 4, 3, 2, 2, 3, 2. Prepare a frequency table and find the mean of the data.
Find the mean of first six multiples of 3.
In a week, temperature of a certain place is measured during winter are as follows 26°C, 24°C, 28°C, 31°C, 30°C, 26°C, 24°C. Find the mean temperature of the week
The mean weight of 4 members of a family is 60 kg. Three of them have the weight 56 kg, 68 kg and 72 kg respectively. Find the weight of the fourth member
The marks of 14 students in a science test out of 50 are given below. 34, 23, 10, 45, 44, 47, 35, 37, 41, 30, 28, 32, 45, 39 Find the maximum mark obtained
_______________ is a representative value of the entire data
Mean of the observations can be lesser than each of the observations.
Find the mean of first six multiples of 4.
The mean age of 25 teachers in a school is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place. If the mean age of the teachers in this school now is 39 years, then the age (in years) of the newly appointed teacher is ______.
