Answer:
She forgot to label the working container with the chemical name. and She transferred a chemical from an original to a working container.
Step-by-step explanation:
Answer:
(a) 84.2
(b) 10.6
Step-by-step explanation:
To solve this questions we can use the standardization formula, where we know that if
then 
So for
(a) we know that the z score for the 70th percentile is 0.524, so using the normalization equation we have


(b) We can procede as above and get

Answer:
333831
Step-by-step explanation:
Answer:
9
Step-by-step explanation:
3
3 x
=
14 42
3