## How do you find the normal CDF on a TI 89?

- TI-89. press “APPS”, Scroll down to Stats/List Editor, press “enter.” Press F5 (Distr) and scroll down to 4 (Normal Cdf).
- TI-83, 84 (&85 I. think)
- TI-89.
- TI-83, 84 (&85 I.
- normalcdf( can be used to give you the % between a lower.

**Where is normal CDF on TI 84?**

Access the normalcdf function on the calculator by pressing 2nd. Then press VARS to access the DISTR menu. ever use normalpdf!!

### Why can the normal distribution be used in Part B even though the sample size does not exceed 30?

Why can the normal distribution be used in part (b), even though the sample size does not exceed 30? Since the original population has a normal distribution, the distribution of sample means is a normal distribution for any sample size.

**Is normal CDF inclusive?**

It seems to be inclusive in 1a. because the upperbound and lowerbound include 65 and 80. In 1b. it asks for values less than 62, so if the upper and lower bound are not inclusive than why is the upperbound 62 instead of 61?

#### How to calculate normalcdf?

1) Press the 2nd key and then press VARS then 2 to get “normalcdf.” 2) Enter the following numbers into the screen: 90 for the lower bound, followed by a comma, then 100 for the upper bound, followed by another comma. 3) Press 75 (for the mean ), followed by a comma and then 5 (for the standard deviation ). 4) Close the argument list with a “)”.

**When do you use normal CDF?**

You use normalcdf when you want to look for a probability, and you use invnorm when you’re looking for a value associated with a probability.

## What does normalcdf find?

Normalcdf is the normal (Gaussian) cumulative distribution function on the TI 83/ TI 84 calculator. If a random variable is normally distributed, you can use the normalcdf command to find the probability that the variable will fall into a certain interval that you supply.

**How do you calculate normal distribution?**

Normal Distribution. Write down the equation for normal distribution: Z = (X – m) / Standard Deviation. Z = Z table (see Resources) X = Normal Random Variable m = Mean, or average. Let’s say you want to find the normal distribution of the equation when X is 111, the mean is 105 and the standard deviation is 6.