units Suppose that the TSH (Thyroid Stimulating Hormone) levels among healthy individuals are normally distributed with a mean of 3.3 . Suppose also that units exactly 98% of healthy individuals have TSH levels below 6.1 . Find the standard deviation of the distribution of TSH levels of healthy individuals. Carry mL your intermediate computations to at least four decimal places. Round your answer to at least two decimal places. [I units x b '9 mL