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junior college 1 | H1 Maths
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Audrey
Audrey

junior college 1 chevron_right H1 Maths chevron_right Singapore

I have answered part (ii) as shown in the image, but the answer provided is 0.655. May I know where have I done incorrectly?

Next, how do I do (iii)?

Help is appreciated. Thanks.

Date Posted: 2 years ago
Views: 1577
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Boy Mow Chau
Boy Mow Chau's answer
317 answers (Tutor Details)
1st
your mistake for (ii) is that you did not square the '2'.

read the explanation in the solution, on when you need to square & when you do not need to square.

and hooray ... in (ii), you remembered to add the variances, instead of subtract (this is commonly overlooked).

please do check for calculation mistakes.