It gives me the wrong answer because of the two zeros that are in the right hand corner

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Posted on Jan 02, 2017

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If the probability of passing the driving test is 0.8, then the probability of exactly 11 people passing the test out of 200 candidates is less than 1 in 10^100, which is zero as far as the calculator is concerned. Is this what you're trying to calculate?

If you want to know the probability that 11 or more people have passed, then you want 1-binomcdf(200,.8,10) which will give you 1 since the probability of 10 or fewer passing is zero.

Think about it. If you have a group of 200 adults, how likely is it that only 11 of them have driver's licenses?

If you want to know the probability that 11 or more people have passed, then you want 1-binomcdf(200,.8,10) which will give you 1 since the probability of 10 or fewer passing is zero.

Think about it. If you have a group of 200 adults, how likely is it that only 11 of them have driver's licenses?

Mar 20, 2014 | Texas Instruments TI-83 Plus Calculator

Press MODE repeatedly until the screen displays "Fix Sci Norm". Press 3 to select Norm.

Feb 24, 2012 | Office Equipment & Supplies

There are a lot of ways to do it. One is to write a program using the cubic formula. If you just want the roots, use the solve() or zeros() functions.

For example, to find the zeros of x^2-6x^2+11x-6, enter

solve(x^3-6*x^2+11*x-6=0,x)

or

zeros(x^3-6*x^2+11*x-6,x)

Note that solve() has "=0" in it while zeros() does not.

solve() will give you an answer of

x=1 or x=2 or x=3

while zeros will give you an answer of

{1 2 3}

which plainly are the same thing, just expressed differently.

For example, to find the zeros of x^2-6x^2+11x-6, enter

solve(x^3-6*x^2+11*x-6=0,x)

or

zeros(x^3-6*x^2+11*x-6,x)

Note that solve() has "=0" in it while zeros() does not.

solve() will give you an answer of

x=1 or x=2 or x=3

while zeros will give you an answer of

{1 2 3}

which plainly are the same thing, just expressed differently.

May 09, 2011 | Texas Instruments TI-89 Calculator

The sine of 6pi is indeed zero. The calculator works with twelve decimal digits while pi is an irrational number with an infinite number of decimal digits. Thus the calculator cannot actually calculate the sine of 6pi, instead it calculates the sine of 18.8495559215. The sine of that number is close to zero but not quite, about 0.000000000002 which is what the calculator shows. This is a natural consequence of using finite machines to deal with infinite numbers.

In degrees, 3*360 is 1080 exactly and thus the calculator can produce an answer of exactly zero.

You'll notice that the calculator also gives a nonzero result for the sine of 4pi.

The "proper" fix for this is something called "argument reduction." If the argument lies outside the range of 0 to 2pi (or alternatively, the range -pi to pi), add or subtract multiples of 2pi until the argument is inside the range. So in this case, subtract 6pi from 6pi to get zero, then take the sine of that.

Bear in mind that argument reduction won't always work, since it too is limited to twelve-digit arithmetic.

In degrees, 3*360 is 1080 exactly and thus the calculator can produce an answer of exactly zero.

You'll notice that the calculator also gives a nonzero result for the sine of 4pi.

The "proper" fix for this is something called "argument reduction." If the argument lies outside the range of 0 to 2pi (or alternatively, the range -pi to pi), add or subtract multiples of 2pi until the argument is inside the range. So in this case, subtract 6pi from 6pi to get zero, then take the sine of that.

Bear in mind that argument reduction won't always work, since it too is limited to twelve-digit arithmetic.

Dec 12, 2010 | Texas Instruments TI-84 Plus Calculator

They're telling you that you have non-zero values stored in M1, M2, and M3. To clear any one of them, store 0 in it by pressing 0 n where n is 1, 2, or 3. To clear all three of them at once, press ON/AC.

Oct 06, 2010 | Texas Instruments TI-30XA Calculator

5sin(x)+1 = 0 is the equation you want to solve?

so

5sin(x) = -1

sin(x) = -(1/5)

arcsin( sin(x) ) = arcsin( -(1/5) )

x = -.201 (radians)

x = -11.5369 (degrees)

so

5sin(x) = -1

sin(x) = -(1/5)

arcsin( sin(x) ) = arcsin( -(1/5) )

x = -.201 (radians)

x = -11.5369 (degrees)

Jun 04, 2010 | Texas Instruments TI-84 Plus Calculator

Glad to be of help.

Feb 17, 2010 | Texas Instruments TI-89 Calculator

Hello,

It may help to have the Brand and model of the calculator. But I suspect you pressed a Mode button, which gives you different configurations (modes of operations) for the calculator. If I guessed right you will have to enter a number between 0 and 3. If mode is not what you want, try a new number each time.

Hope it helps.

It may help to have the Brand and model of the calculator. But I suspect you pressed a Mode button, which gives you different configurations (modes of operations) for the calculator. If I guessed right you will have to enter a number between 0 and 3. If mode is not what you want, try a new number each time.

Hope it helps.

Sep 10, 2009 | Office Equipment & Supplies

Or you can press the [S<->D] button (right above the DEL key) and it will switch between fractions and decimals. Or alternatively you can take it out of COMP mode and put it in STAT mode.

Mar 29, 2009 | Casio FX-115ES Scientific Calculator

-1E-13 is a very small number. When doing this kind of a problem you can regard 1E-13 as 0.

Remember that pi is an irrational number. It is only estimated on your calculator. I just played around with a TI-83 and found the following answers:

cos(pi/2) = 0

cos(2*pi + pi/2) = 0

cos(4*pi + pi/2) = 1E-13

cos(20*pi + pi/2) = -1E-13

As you know, that correct answer to each of these is 0. The calculator gives non-zero answers because some very small errors are accumulating. There is nothing wrong with your calculator.

Remember that pi is an irrational number. It is only estimated on your calculator. I just played around with a TI-83 and found the following answers:

cos(pi/2) = 0

cos(2*pi + pi/2) = 0

cos(4*pi + pi/2) = 1E-13

cos(20*pi + pi/2) = -1E-13

As you know, that correct answer to each of these is 0. The calculator gives non-zero answers because some very small errors are accumulating. There is nothing wrong with your calculator.

Nov 20, 2007 | Texas Instruments TI-83 Plus Calculator

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