If 100% of a number is 15, then what is 50% of the number?

7.5

Step-by-step explanation:

One way in which you could do this problem would be to write and solve an equation of ratios:

100%          15

 =

 50%            x

Cross multipying results in 100x = 750, so that x = 7.5.

50% of the number is 7.5.

what the question so we can you out

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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