Bond price changes can be estimated by multiplying the Mcaulay duration with yield change. True?

True

correct

I dont know

false 

The so-called duration McCauley assumed equal to the value of100 pounds for the period known as the weighted average

TRUE..............

True.

If we use those fractions to compute a weighted sum of the maturities of the little hypothetical zero-coupon bonds, we get a number called the Macaulay duration, or simply the duration, of the actual bond

It's above my knowledge, but I will agree with most of the experts.

Dear Sir, Thank you for the invitation to answer on a complete blank field for me, so digging up information, mathematical formulas and trying to understand what all the parameters mean, I would say: TRUE