(6x + 7) + (13x + 21) = 180 x =
1 answer:
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Answer:
The new mean for the exam scores is 51
Step-by-step explanation:
the mean can be calculated using the formula
mean of scores =
before the 20 points was added, the mean of the score was = 50.
Inserting this into the formula, we have:
50 =
from this, we can compute the sum total of the scores as
sum total = 50 × 20 = 1000
when the extra 20 marks is added, the sum of the entire scores will be changed to 1000 + 20 = 1020.
Hence the new mean will be computed as (New Sum total of scores / Number of students)
= = 51.
∴ The new mean of the scores is = 51
X=-2
You can also check by plugging -2 in for x. Here is a picture. Please notify me if I made an error!
You can also check by plugging -2 in for x. Here is a picture. Please notify me if I made an error!