18)For the standard normal distribution, find: P(-1.64 < z < 2.06)

19)For a standard normal distribution, find c if P(z < c) = 0.6935

20)For a standard normal distribution, find c if P(z > c) = 0.9449

21)Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0C and a standard deviation of 1.00C. A single thermometer is randomly selected and tested. Find the probability of obtaining a reading between -1.936C and -0.277C. P(1.936

Answer: P(Z<0.606)=P(Z<-0.606)=

23)Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0C and a standard deviation of 1.00C. A single thermometer is randomly selected and tested. Find the probability of obtaining a reading less than 0.851C.

Answer: P(Z<0.851)=

24)Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0C and a standard deviation of 1.00C. A single thermometer is randomly selected and tested. Find the probability of obtaining a reading greater than 0.714C.

Answer: P(Z>0.714)=

25)A manufacturer knows that their items have a normally distributed lifespan, with a mean of 8.4 years, and standard deviation of 1.8 years. If you randomly purchase one item, what is the probability it will last longer than 3 years?

26)A particular fruit's weights are normally distributed, with a mean of 381 grams and a standard deviation of 11 grams. If you pick one fruit at random, what is the probability that it will weigh between 375.5 grams and 383.2 grams?