I need the set up and I'm solving for x, please help.

100 + 40 + 2x = 180

combine like terms

140 +2x = 180

-140         -140

2x = 40

/2    /2

x = 20

1 3 5

step-by-step explanation:

i took the test: )

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: