Mean height of 20 stidents is 4'6".if two more students of heightn4'7"and4'9"joined the class,then find the meanof height of students.(hint:1feet=12inches)
Answers
Answer:
X1+X2+---------+X20/20 = 4'6"
4'6" can be written as 4 feet + 6 inches
= 4*12+6
= 54 inches
Total height of 20 students = 20*54 = 1080 inches
X21 = 4'7" = 4*12 + 7 = 55 inches
X22 = 4'9" = 4*12 + 9 = 57 inches
Total mean height of 22 students = X1+X2+------+X20+X21+X22/22
= 1080+55+57/22
= 54.18 inches
Answer: the mean height of the students is 54.18 inches or 4'6 3/16''
Step-by-step explanation:
The mean height of 20 students is 4'6''. If two more students with height 4'7'' and 4'9'' joined the class, then find the mean.
First convert feet to inches
4'6''=4*12+6 =54inches
4'7''=4*12+7=55inches
4'9"=4*12+9=57inches
Let x be the sum of the height of 20 students
Note that x/20 = 54, thus x=20*54
x=1080
To solve the new mean, (1080+55+57)/22 = 192/22
=54.18 inches
convert to feet so you will have 4'6 3/16"