Advertisements
Advertisements
प्रश्न
The mean height of 11 students in a group is 150 cm. The heights of the students are 154 cm, 145 cm, Y cm, Y + 4 cm, 160 cm, 151 cm, 149 cm, 149 cm, 150 cm, 144 cm and 140 cm. Find the value of Y and the heights of two students?
Advertisements
उत्तर
Mean Height = `"Sum of heights of all students"/"Number of students"`
150 = `(154 + 145 + "Y" + ("Y" + 4) + 160 + 151 + 149 + 149 + 150 + 144 + 140)/11`
150 = `(1342 + "Y" + "Y" + 4)/11`
150 = `(1346 + 2"Y")/11`
150 × 11 = 1346 + 2Y
1650 = 1346 + 2Y
2Y = 1650 – 1346 = 304
Y = `304/2` = 152
Height of two students are Y and Y + 4
⇒ 152 and 152 + 4
⇒ 152 cm and 156 cm
APPEARS IN
संबंधित प्रश्न
The mean of 5 observations is 50. One of the observations was removed from the data, hence the mean became 45. Find the observation which was removed.
If `barx` is the mean of x1, x2 ............xn and `bary` is the mean of y1, y2, …….yn and `barz` is the mean of x1, x2 ............xn, y1, y2, ……….yn then `barz` =?
In a research laboratory scientists treated 6 mice with lung cancer using natural medicine. Ten days later, they measured the volume of the tumor in each mouse and given the results in the table
| Mouse marking | 1 | 2 | 3 | 4 | 5 | 6 |
| Tumor Volume (mm3) | 145 | 148 | 142 | 141 | 139 | 140 |
Find the mean
The average of the marks 2, 9, 5, 4, 4, 8, 10 is ____________
The mean of first fifteen even numbers is ____________
Arithmetic mean of 15 observations was calculated as 85. In doing so an observation was wrongly taken as 73 for 28. What would be correct mean?
Let x, y, z be three observations. The mean of these observations is ______.
Mean of the data is always from the given data.
Mean of the observations can be lesser than each of the observations.
The marks in a subject for 12 students are as follows:
31, 37, 35, 38, 42, 23, 17, 18, 35, 25, 35, 29
For the given data, find the mean
