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A. 360

Step-by-step explanation:

(10 x 13) + (8 x 13) + (6 x 13) + 2(1/2(6 x 8))

= 130 + 104 + 78 + (6 x 8)

= 312 + 48

= 360

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step-by-step explanation:

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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step-by-step explanation: