Question 1
Question
Maths
May 5, 2018, 8:29 a.m.
Answer
An object ,4cm in size, is placed at 25cm in front of a concave mirror of focal length 15cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Find the nature and size of the image
If 3x 7y=14,express y in terms of x. Check whether (3,-2)is a point on the given line
Maths
May 4, 2018, 3:43 p.m.
Answer
The first of two samples has 100 items with mean 15 and standard deviation of 3. If the whole group has 200 items with mean of 15.6 and standard deviation √(13.44). Find the standard deviation of the second group
