Assume the readings on thermometers are normally distributed with a mean of 0 degrees C and a standard deviation of 1.00 degress C. Find the probability that a randomly selected thermometer reads between -2.21 and -1.52 and draw a switch then find the probability.

The standard normal distribution has a cumulative distribution function (probability that the random variable, in this case the temperature, is less than a given number) well-known as erf, and the probability of is (found using WolframAlpha)

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its kind of blurry. can you put a clearer pic?

step-by-step explanation:

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6