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## anonymous 5 years ago The heights of a certain species of plant are normally distributed, with mean 23 cm and standard deviation 1 cm. What is the probability that a plant chosen at random will be will be between 20.5 and 25.5 cm tall?

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1. anonymous

do you know about converting to standard normal and using z score?

2. anonymous

im learning it sorta

3. anonymous

ok well the formula to convert to a value of z: $(X-\mu)/\sigma$

4. anonymous

so you would have (25.5-23)/1 and (20.5-23)/1 -2.5<z<2.5

5. anonymous

then you can look up the probability on a standard normal chart. Try that and let me know if you need help

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