In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: joan and karl each bought a telescopes and the sum of their purchases was $ 400 . if twice of what joan paid was $ 74 more than what karl paid , what did joan pay for her telescope ?
Options: a ) $ 150 , b ) $ 152 , c ) $ 154 , d ) $ 156 , e ) $ 158
[EX A]: e

[EX Q]: Problem: find the smallest positive integer n such that 11 n - 1 is divisible by 105 .
Options: a ) 3 , b ) 4 , c ) 5 , d ) 6 , e ) 7
[EX A]: d

[EX Q]: Problem: a bell curve ( normal distribution ) has a mean of 1 and a standard deviation of 1 / 8 . how many integer values z are within 3 standard deviations of the mean ?
Options: a ) 0 , b ) 1 , c ) 3 , d ) 6 , e ) 7
[EX A]:
b