Answer:
= 177.66
Step-by-step explanation:
you add all the pounds gained by group A in the 3 weeks which is 59.22 and then you multiply by 3 to give you 177.66
15^2 + 25^2 = X62
225 + 625 = x^2
850 = x^2
x = 5sqrt(34)
if you need it as a decimal = 29.1547
Answer: Tammy's sample may not be vaild because she surveyed the students only from her class and it is likely that other classes might not like the subject maths. She might get the accurate results by surveying a larger number of people in the school instead of just her class.
