Ms. Mastrianni hung artwork on 2/5 of a bulletin board. She hung math papers on 1/5 of the same bulletin board. What part of the bulletin board has artwork or math papers?

The part of the bulletin board has artwork or math papers

Step-by-step explanation:

Given: Part of bulletin board has artwork =

Part of bulletin board has math papers =

The part of the bulletin board has artwork or math papers =

Hence, the part of the bulletin board has artwork or math papers

how is that middle school

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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