25 pts! Will make brainliest, could someone help me please? TwT

1 = the average of sleep hours would be - h

2 = the average of test scores would be - %

3 = the average of the product of sleep hours and test scores (h×%)

4 = the average of the square of sleep hours (h×h)

a) The equation of your best-fit (least-squared-error) line is then

 % = (a3 - (a1×a2))/(a4 - (a1)²)×(h - a1) + a2

In numbers, this is

 % = 6.33333h + 38.6875

b) In the  h = 8, the equation gives

 838.6875 + 6.33333×8  ≈ 89.4

0.85 or 85%

step-by-step explanation:

1) divide 23 by 27

2) round the decimal to the nearest 10

3) so your answer would be 0.85 or 85%

its totaly b

your welcome btw