A does 20% less work than B. If A can complete a work in7 ½ h, then B can do it in ???

6 days.

Step-by-step explanation:

It's simple

So, find 20% of 7.5 i.e. 1.5

Then,we all know as work increases time decreases and vice versa.

So, 7.5-1.5 = 6

Hope it helps!

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: