Stephanie scored 88, 70, 84, and 72 on her first four science tests. What score does Stephanie need on her fifth science test to receive a mean score of 80?
can you give me the steps to solve this im practicing for hsa
What is hsa?
She has a total of 314 points now.
After the fifth test, the total points possible is 500.
0.8 * 500 = 400
400 - 314 = 86
She'll need an 86% to get a mean score of 80.
high school assessment and thank you
how did you get 500 possible points?
and where did you get 0.8?
Mean = ∑x/n
80 = (88+70+84+72+x)/5 = ?
=86 ok thank you i get it know
Certainly! To find out what score Stephanie needs on her fifth science test, we can use the formula for mean (average) score, which is the total sum of all scores divided by the number of scores.
Step 1: Add up the scores Stephanie has already received:
88 + 70 + 84 + 72 = 314 (this is the sum of the first four test scores)
Step 2: Determine the number of scores Stephanie has received:
Stephanie has received 4 scores so far.
Step 3: Calculate the mean score Stephanie needs to achieve:
(mean score) = (total sum of scores) / (number of scores)
80 = 314 / 4
Step 4: Solve for the total sum of scores that Stephanie needs:
80 * 4 = 320 (total sum of scores required to achieve a mean score of 80)
Step 5: Determine the score Stephanie needs on her fifth science test:
To find out the score Stephanie needs on her fifth test, subtract the sum of the first four tests from the total sum of scores required.
320 - 314 = 6
Therefore, Stephanie needs a score of 6 on her fifth science test to achieve a mean score of 80.