Helena scored a 75 on a history exam and an 80 on a science test. The class average for the history test was 70 with a standard deviation of 2.5. The class average for
the science test was 75 with a standard deviation of 5. She believes that she did
better in science than history in comparison with her class. Explain her error

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Ithink the answer will be 5

1.   an exact solution requires a radical solution - no decimal approximation.2. (a)4x^3 = 756x^3 = 756/4 = 189x =   cube root of 189 =   5.74   to nearest hundredth answer(b)   189 = 3*3*3*7   so we can write the cube root of 189 as 3∛7 answerchecking (a) 4*(5.74^3 =   756.48   which is very close(b)   4* ((3∛3)^3   = 4*189   = 756   - spot on! 3. i would use solution b because the original question asked for an exact solution.