Suppose the level of calcium in the blood in healthy young adults varies with mean about 9.6 milligrams per deciliter and standard deviation about σ = 0.3. A clinic in rural Guatemala measures the blood calcium level of 140 healthy pregnant women at their first visit for prenatal care. The mean is x = 9.67. Is this an indication that the mean calcium level in the population from which these women come differs from 9.6?

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.