There is 60% of boys in one class, and 5%of them has an A from math. How many percent of boys has an A in a whole class(100%)?

91.66%

Step-by-step explanation:

is 60% of boys in one class, and 5%of them has an A from math so it shold be 55%.first of all we make 100% of 60 % so we will multiply  and divide

55*100/60 sothe answer is 91,66%

throw the computer

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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