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first one is 40 and then 65 and then 65 again

x = 40°

y = 65°

n = 65°

Step-by-step explanation:

6:

70 + 70 = 140

180 - 140 = 40

7:

55 + 60 = 115

180 - 115 = 65

8:

180 - 50 = 130

130 / 2 = 65

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: