Eighty percent of 320 students is 0.80(320 students) = 256 students.
x-y=13
x=13+y--(1)
4x+2y=10
2x+y=5
26+2y+y=5
3y=-21
y=-7
Substituting value of y in equation (1)
x=13-7
x=6
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Given:
z = (x - μ)/σ = z value
x = independent variable = 11
μ = mean = 8
σ = standard deviation = 3
Solution:
X ~ N (8, 3)
For day 1, n = 5
P (X < = 11) = P (Z < = 11 – 8 / 3/Sqrt5) = P (Z <
=2.23) = 0.987126
For day 1, n = 6
P (X < = 11) = P (Z < = 11 – 8 / 3/sqrt6) = P (Z <
=2.45) = 0.992857
For both days:
P (X <= 11) = P (X <= 11) = (0.987126) (0.992857) =
0.9801
Answer:
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