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the answer would be -50

Step-by-step explanation:

This is becaus if u think about it 40+40= 80 but here we have 30 so we just take that extra number and add to the other 4 so this way u get 50. Or u can do 80 - 30=50 and u get ur answer -50

Hope this 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: