Determine whether the variable is qualitative or quantitative favorite brand of computer

Brand Of computer represents a Quality not Quantity.

Quality of computer is determined by material and technology used in the computer and whether it is durable, portable and machinery used are of latest technology or not.

While Quantity is denoted in terms of Real Numbers.

Favorite Brand of Computer=Qualitative  

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step-by-step explanation:

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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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