Julie reads 1/3 of a book on Tuesday and 1/4 of the book on Wednesday. How much of the book does she have left to read?

5/12

Step-by-step explanation:

The whole book can be represented as 12/12 because 12 divided by 12 equals one whole ( or one). 1/3 * 4/4(one rewritten) = 4/12 We then need to add this to 1/4 * 3/3 (one rewritten again) = 3/12

4/12 + 3/12 == 7/12

7/12 is the amount Julie did read so we subtract this from 12/12 to get the

5/12

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

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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