The recommended dietary allowance (RDA),which is the intake that would be sufficient for 97% to 98% of the population; and the tolerable upper level (UL), the intake that is unlikely to pose health risks. For women aged 19 to 30 years, the EAR is 60 milligrams per day (mg/d), the RDA is 75 mg/d, and the UL is 2000 mg/d.

(a)The researchers assumed that the distribution of requirements for vitamin C is Normal. The EAR gives the mean. From the definition of the RDA, let's assume that its value is the 97.72 percentile. Use this information to determine the standard deviation of the requirement distribution.

Mean = 60mg/d

97.72 percentile = 75 mg/d

P(X < A) = P(z < (A - mean)/standard deviation)

For 97.72, z value = 2

So, (75 - mean)/standard deviation = 2

(75 - 60)/ standard deviation = 2

Standard deviation = (75-60)/2 = 7.5 mg/d

Please help with the sketch

B - Sketch the distribution of vitamin C requirements for 19- to 30-year-old women. Mark the EAR, the RDA, and the UL on your plot.