WORD PROBLEMS on Statistics 4 for Class 9 and 10
Question for practice
The following questions are more helpful for class tenth and class ninth students for all boards.
Questions 4. The mean of the numbers 6, 10, x, 11, 12, y is 10 and x - y = - 7, find the values of x and y.
Submit your answer here in the comments or wait for answer
The following questions are more helpful for class tenth and class ninth students for all boards.
Questions 4. The mean of the numbers 6, 10, x, 11, 12, y is 10 and x - y = - 7, find the values of x and y.
Submit your answer here in the comments or wait for answer
x=7
ReplyDeletey=14
MEAN = SUM OF OBSERVATIONS/NO. OF OBSERVATIONS
ReplyDelete10 =(6+10+x+11+12+y)/6
10 =(39 + x + y)/6
60 =39 + x + y
21 = x + y or x + y = 21 -------[1]
x - y = -7 -----[2]
By elimination
x= 7
y = 14
MEAN=SUM OF OBSERVATIONS/NUMBER OF OBSERVATIONS
ReplyDeleteTHEREFORE
(6+10+x+11+12+y)/6=10
39+x+y=60
x+y=21(1)
x-y=-7(2)
FROM (1) AND (2) WE GET
2x=14
x=7
WE KNOW THAT x+y=21
THEREFORE y=14
WE GET
x=7
y=14