Over 70 application functions have been implemented so far.

The full list is here.

For instance, if you want to compute an average, it is easier than on *HP-35s*!

## Common Experiment Processing

**Given**: In the dance class of 10 students, the heights were measured at 147, 152, 165, 163, 168, 163, 175, 166, 170, and 167 cm.

**Find**: The mean height and its standard deviation in the class.

- Type
`clear sum`

,`<Enter>`

(a shortcut is`<F1>`

,`<A>`

, which displays`clear`

) - Type
`sum 147`

,`<Enter>`

- Type
`sum 152`

,`<Enter>`

- Continue for the other 8 numbers. Instead of typing sum, you also can type a number and press
`<F1>`

,`<S>`

- After each number the calculator displays number of samples, the mean and standard deviation.

After entering all 10 numbers, the display shows:

**N____________________10**

**StDev________ 8.30261003**

**Mean______________163.6**

**Sum updated____________**

**>_**

**Answer**: the average height of the class student is 164 cm (68% of samples are in the interval of 164±9 cm).

## Normal Distribution and Probability

**Given**: In the dance class as above, assume normal distribution and fair representation of the school population.

**Find**: (1) Probability the next class participant is taller than 175 cm. (2) Interval of heights for 95% of the school population.

- Type
`prob(175)`

,`<Enter>`

- The calculator displays: 0.91513344. This is the probability the next participant is
*under*175 cm. - To find the answer, type
`1`

,`<Enter>`

,`<Arrow Down>`

,`<->`

. The calculator displays: 8.48665622e-002. - Type
`1`

,`<Enter>`

,`0.95`

,`<->`

,`2`

,`/`

,`probit`

,`<Enter>`

. - The calculator displays: 147.3(...) This is the lower value.
- Type
`probit( 0.975)`

,`<Enter>`

. - The calculator displays: 179.9(...) This is the upper value.

**Answer**: (1) the probability to find a student taller than 175 cm is 8.5% . (2) In the school, 95% of the students are in the interval between 147.3 and 179.9 (or 163.6±16.3) cm in height.

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fantastic work done!

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