What is the value of the expression: 4.6+(-3.2)

1.4

Step-by-step explanation:

4.6 + (- 3.2)

A plus sign and a minus sign results in a minus sign

Re-write the expression without the parenthesis

4.6 - 3.2

Subtract

1.4

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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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