Hello!
The mean is 86 and the standard deviation is 3
You see how many deviations are between 86 and 89
86 + 3 = 89
From the median to the first deviation is where 34.1% of the results fall
Convert the percent to a decimal
34.1% = 0.341
Multiply this by the amount of test taken
200*0.341 = 68.2
The answer is B)68
Hope this helps!
He is not correct, his mistake was multiplying 1/2 to 2x and 1, when you should have multiplied the negative to them.
They have to give more information like home much she makes so we can make a equation so like if she made $5 every hour the equation would be
5+x=y
X is the extra she makes and y is the amount in total
on the sixth day 46 - 16 = 30 30/5 = 6
or
16+5 =21
21+5 = 26
26 + 5 =31
31+5 = 36
36 +5 =41
41 +5 = 46
2x^2-y
=2 (3)^2 -(-2)
=2(9) +2
=18+2
=20
Hope this helps!