How do you calculate expected value on the sharp el 520w

Hi there,

If it can be done, you need to press SETUP then choose CTRST and use your left and right arrow keys to adjust the darkness of the digits on the screen. Unfortunately, some of the older models do not have this ability so if you do not find that that menu option it means that you cannot do it on the calculator.

First, the Poisson Distribution describes events which have a small probability of occurrence at any very precise single value, like 3.546732190, but which nonetheless occur very very frequently in a range of values. Also the mean or average or expected value are the same as the variance, in your case, three (I think you meant three).

So looking up the tables for this (or plugging it in Excel) the prob x=4 exactly is 0.1680

I doubt that it has a glitch. Although possible, it is not very probable. Try to use the calculator correctly.
Follow the algebraic logic.
If you did not input any value the answer memory contains the value 0.
When you press (+/-) followed by [=] it takes the value in answer memory and negates it, thus giving you (-0).
Adopt a consistent way of inputting numbers, namely always enter the negation sign before the number that is negated. The calculator will enclose the negated number between parentheses, which prevents may errors. Too bad this feature has not been kept in more recent calculators by Sharp.

You need a SHARP with Write-View display capabilities. The EL-531X is unable to show that. The Write-View calculators from Shard have a W, example EL-W516 followed by Write-View. Not to be confused with the W in EL-520W

Unfortunately, you don't. The EL-520W can show fractions, but not radicals.

On the back of the calculator, there is a little "reset" hole. Use a pen and press it into that hole for a few seconds, then release. You should now be able to turn on your calculator as if it was brand new from factory without the "p".

The Casio FX-115W/991W/115E/991ES have three functions P(, Q(, R( and t(: the last one calculates the normalized variable noted t.



The Sharp EL-520W ans several similar Sharps do it too. Here is a screen capture.

The Casio FX-115W/991W/115E/991ES have three functions P(, Q(, R( and t(: the last one calculates the normalized variable noted t.



The Sharp EL-520W ans several similar Sharps do it too. Here is a screen capture.

It's very simple: the calculators have a default base 10 so that log x it's log x base 10 so here is some logs:
log x base y = log x / log y
log (x*y) = log x + log y
log (x/y) = log x - log y
Hope it's helped