Please help i only have a few minutes!! Determine the elements of the set shown below.
(AUB)

A. {r, t, v, x}
B. {r, s, t, u, V, W, X, Z}
C. {s, u, w}
D. {t, v, x}

168

step-by-step explanation:

i am pretty sure that the answer is 168

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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