S storeys Height of each storey=h Figure 2: A building of S identical stories, each of height h. b A building has S stories each of height h as shown in Fig.(2). An ex- plosion destroys the strength of the nth story. You may assume that the building remains intact above the story that explodes and that momentum is conserved in the collisions of the successive stories during the fall of the building. Estimate the time before the (n + 1)th floor hits the ground falling vertically.

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step-by-step explanation:

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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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