12. multi-step the classroom has 12 chairs on
the right side of the room, 15 chairs on the
left, and 9 chairs stacked in the back. mrs. kim
wants to divide the chairs evenly into 3 groups.
which expression represents the situation?
(a) 12 + 15 +9x3
b
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d
12 + 15 + (9-3)
12+15+9+3
(12 + 15 + 9) = 3

step-by-step explanation:

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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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