Botanists at the Arizona State University in Tempe, Arizona have been collecting cactus growth data for more than 50 years. In the past few years, sulfate content in water samples from saguaro cactus has averaged 7.48 mg/L with a standard deviation of 1.6 mg/L. If 10 students measure the sulfate in their samples, what is the probability that the average sulfate will be between 6.49 and 8.47 mg/L? Would the probability increase if it was found out that the standard deviation is really 1.8 mg/L? Explain and include your solutions. O a Probability is about 95%. Increasing the variation will decrease the probability O b. Probability is about 91%. Increasing the variation will decrease the probability Oc Probability is about 95%. There would no effect on the probability if the standard deviation changes Od. NONE

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