Recent content by koudai8

Homework Statement I came across a question like this on a test today, and it says it would be helpful to simplify before differentiation. However, I could not find ways to simplify (1- cos(x))/(1+cos(x)). Homework Equations ln((1- cos (x))/(1+cos(x)))^7) The Attempt at a Solution...

Is it not 0.52? (probability)

Hi, the following is a list of binomial cumulative distribution of the probability that out of 25 investors, the number of investors that would have exchange-traded funds in their portfolios. We were asked for the probability that at least 14 investors do not have exchange-traded funds in...

Hi, I've solved it already. I defined profit by [(-1)+1]+[(-5)+1]+[(-25)+1]+[(-100)+1]+[(-350)+1]+[(-1000)+1]+1

[solved]Expected Value and Variance Hi, I have a problem on Expected Value and Variance, and having spent hours but still couldn't figure out :( One state lottery has 200 prizes of $1 100 prizes of $5 40 prizes of $25...

That's all I need. Thank you both.

I just thought the other value is the absolute minimum, not the local minimum, so I didn't include it as the local minimum. So, the absolute is ALWAYS also a local one?

So all absolute are also locals? Never knew that. Thanks.

The question asks for local minimum of x^4-9x^3+9x^2+5x-4. The answer was x=-0.21 and 5.96. I thought 5.96 is the absolute minimum, since it gives the loweset y value on the open interval. Where am I wrong. Thanks.