A circular running track is 1/3 miles long. Zoe runs on this track, completing each lap in 1/21 of an hour. What is Zoe's running speed? a) 7 hours per lap
b) 3 miles per hour
c) 7 miles per hour
d) 1/7 lap per hour

b

Step-by-step explanation:

1 mile = 3 laps.

3x7=21

21=hour

21/7=3

2nd one in the first row is correct

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: