Arunner incregses
her speed from 3.1
m/s to 3.5 m/s
during the last 15
seconds of her run.
what was her
acceleration during
her big push to the
finish?

a = 0.027 m/s²

Step-by-step explanation:

a = v₁ - v₀ / t

v₁ = 3.5

v₂ = 3.1

t = 15

then

a = (3.5 - 3.1) / 15

a = 0.4 / 15

a = 0.027 m/s²

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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