2/3(x-9)= -11 what is the answer for x

x = -  

Step-by-step explanation:

Given

(x - 9) = - 11

Multiply both sides by 3 to clear the fraction

2(x - 9) = - 33 ← distribute left side

2x - 18 = - 33 ( add 18 to both sides )

2x = - 15 ( divide both sides by 2 )

x = -

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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