Question

Q10. V3 is equal to
(a) 5/6
(b) 675
Q11. The rationalisation factor of 3 is
(c) 130
(d) 25
1
(a) -V3
(b) 73
(c) 213
(d) -2.3
1
212.
59-18
is equal to
1
3
(a) 3+212
(b)
3+212
(c) 3-22
(d)
2
13.Find the H.C.F. of a’ +a-42 and a? - 2a-24
(a) a-5
(b) a-6 (c) a-7
4. Find the L.C.M. of a b2 and a²bc
(d) a-8​

Answer 1

Answer:

This is a classic example of finding mean and standard deviation using Z values.

From this page find the Z value corresponding to 31% area under the curve and 92% (100-8) percent area under the curve.

Math Is Fun Virtual Manipulative

Note: You'll probably be given tables to lookup in your quizzes.. they're a bit confusing. But you might as well learn how to use it.

As you know:

Z=X−μσZ=X−μσ

Put in X and Z values values twice, you'll have two linear equations. Solve them and the answer is yours!