For homework, Anya had to find the width of a bedroom
after the scale changed from 1 inch : 4 feet to 1 inch : 7
feet. Her work is shown below.
What error did Anya make?
O She set up the proportion incorrectly; the second
ratio should be 2.
1 inch: 4 feet
1 inch : 7 feet
4 in.
O She cross-multiplied incorrectly.
O She divided incorrectly.
2 in.
O She used the wrong label; it should be inches.
7x=2
x= = feet

you never say the total so we cant find the percentage used for petrol

step-by-step explanation:

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: