Recent content by jinx007

Oh if i understand you, you are saying that i must add 17 and 23 which is equal to 40 then i divide by 40.. ? but the answer is not correct, or i have misinterpreted you..?? If i know how to find the mean i can work out the variance. Just help me to find the mean.!

A computer can generate random numbers which are either 0 or 2. On a particular occasion, it generates a set of numbers which consists of 23 zeros and 17 twos. Find the mean and variance of this set of 40 numbers. Please help i just don't know where to start. In fact i am thinking of...

Ivan throws three fair dice. (i) List all the possible scores on the three dice which give a total score of 5, and hence show that the probability of Ivan obtaining a total score of 5 is 1/36 MY PROBLEM HERE IS THAT I CANNOT...

Find how many 3 digits odd number that can be obtained from the digit 1,2,3,4,5,6,7 if, 1/ Repetition of digits not allowed 2/ Repetition of digits allowed my work 1/ --- the last i digit i have control 1,3,5,7 so 2 remaining digits = 6 P 2 x 4 (4ways)...

It is relative to the block(object)

An object of mass 3 kg lies on a rough plane inclined at 45 degree to the horizontal. The coefficient of friction is 0.2 and a force of 10 N acts at 30 degree to the object. Calculate the friction. According to the booklet the answer is 3.24 N My work F = u R Normal reaction = 10 sin...

A block of mass 3 kg is on a rough inclined plane at 30 degree to the horizontal. The coefficient of friction is 0.2 and a force of 10 N acts upward parallel to the plane. Find the friction? The answer to the question is 5N my work Normal reaction= 30 cos 30 Using F = u R (0.2 x...

Awww..but what is the answer..?..

chain rule that is dy/dx = dy/dt x dt/dx of course i must apply it

I am confuse a question state f(x) = (ln x )^2 ... i skip a part.. show that f'' (x) = 0 (not concern with the answer but what does f'' means is it that i have to differenciate twice or integrate twice..??) my second question: how to differenciate y = (ln x )^2

So i think that its the work done of moving the object to the top this is equal to the kinetic energy..! i am right..?

So p.e is 20 kN x 12 What about the kinetic energy..?? no speed...what should i do...

So some converts to kinetic energy and potential enegy..please just tell me whether i am on the right track and if the answer is correct... thanks in advance

A constant force of 9 kN parallel to an inclined plane, moves a body of weight 20 kN through a distance of 40m along a plane at a constant speed. The body gains 12 m height.. HOW MUCH WORK IS DISSIPATED AS HEAT? A/ 120 KJ B/ 240 KJ C/ 360 KJ D/ 600 KJ So workdone = f x d but...

the question is about uncertainty..why are you working with fractional error...please start the number...work out the first part i will get a better idea of how to attempt the question