Question:
If 5 is subtracted from each observation and then divided by 20, then what is the new arithmetic mean?
If 5 is subtracted from each observation and then divided by 20, then what is the new arithmetic mean?
Options:
- a) 2.25
- b) 3.5
- c) 4.25
- d) 5.5
- a) 2.25
- b) 3.5
- c) 4.25
- d) 5.5
correct answer : a)
Explanation:
tan 60° = h
x
Þ h = 3x
tan 45° = h
bx+
Þ
h = b + x Þ 3x = b + x
x = b() 31
2
+
Þ
h = MN = 3xx = 33
2
+
b
tan 60° = h
x
Þ h = 3x
tan 45° = h
bx+
Þ
h = b + x Þ 3x = b + x
x = b() 31
2
+
Þ
h = MN = 3xx = 33
2
+
b