You basically have a system of 3 equations with 3 unknowns.
5x/3 + y = c;
2y = c - 4x;
x + y = 6;
Substitute say the third equation into the second one.
2(6-x)=c-4x
Solving this for x gives you:
x=c/2 - 6
Now we can substitute the third equation onto the first one:
5x/3 + (6-x) = c
And now substitute for x= c/2 - 6 to get an equation which is only in terms of c. Therefore you can get the value of it form there.
50 girls attended the trip.
80 boy + 50 girls = 130 total students
8x10 =80
5x10=50
multiply both by 10.
C. Is incorrect.
4^2 = 16 and 5^2 = 25. 12 is not between 16 and 25 so sr(12) is not between 4 and 5.
sr(12) is between 3 and 4
Complete question :
Swim team Hanover High School has the best women’s swimming team in the region. The 400- meter freestyle relay team is undefeated this year. In the 400-meter freestyle relay, each swimmer swims 100 meters. The times, in seconds, for the four swimmers this season are approximately Normally distributed with means and standard deviations as shown. Assuming that the swimmer’s individual times are independent, find the probability that the total team time in the 400-meter freestyle relay is less than 220 seconds. Follow the four-step process
Answer:
0.225
Step-by-step explanation:
Given the data:
Swimmer__ Mean __Std. dev.
Wendy ___ 55.2 ____ 2.8
Jill _______ 58.0 ____ 3.0
Carmen____56.3 ____ 2.6
Latrice_____54.7_____2.7
Team average = (55.2 + 58 + 56.3 + 54.7) = 224.2
Team standard deviation = (2.8 + 3 + 2.6 + 2.7) = 11.1
Standard Error = 11.1 /sqrt(n)
Standard Error = 11.1 / sqrt(4)
Standard Error (S. E) = 11.1 / 2 = 5.55
P(x < 220) :
(x - mean) / S.E
(220 - 224.2) / 5.55
= −0.756756
P(Z < - 0.757) = 0.22452
P(Z < - 0.757) = 0.225
2, 4, 6, 8, 10, 12
difference is 2