Let x be the sum of the series 1¹ + 2² + + 1680¹⁶⁸⁰. think of x as a long string of numbers. cut it into 4 digit numbers, then find those which are prime numbers and contain the number 6 and multiply their sum with the devil's number. the solution for this riddle can be used 3 times as priority password.

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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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step-by-step explanation:

113.42

i hope that is right.

step-by-step explanation: