The first and second steps to solve the equation StartFraction 3 x over 5 EndFraction + 5 = 20 are shown below.

StartFraction 3 x over 5 EndFraction + 5 minus 5 = 20 minus 5
StartFraction 3 x over 5 EndFraction (Five-thirds) = 15 (five-thirds)

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.

click to let others know, how is it

0.0

0 votes

1

report

read more on -

step-by-step explanation: