# All Questions

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4answers
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### Difference between “faster than” and “as fast as”

I want to say that, speed-of-A = (7/4)* speed-of-B. The two sentences that I can think of are: A runs 7/4 times faster than B. A runs 7/4 times as fast as B. I'm told that 1st version is incorrect. ...
2answers
264 views

### What does “a value that lies z or more standard deviations above the expected value” mean?

This phrase came from the book Understanding Probability written by Henk Tijms. The original sentence is: the probability that a normally distributed random variable will take on a value that lies ...
2answers
250 views

### Words choice in math related question: “Is this notation [ valid / correct ] for [ showing / expressing ] this summation ?”

I was studying math and while doing some summations I made a notation and I don't know if it's valid/ correct so I was about to ask that on the StackExchange Math Community when I realized that I didn'...
1answer
589 views

### What is the meaning of “they swim up a gradi­ent of nutrients”?

I could not figure out what the sentence shown in below means. What are the meanings of "as" and "they swim up a gradi­ent of nutrients"? Also what is the meaning of "gradient" in here? Even ...
2answers
75 views

### What's the meaning of “out of”?

average score for admitted students is currently 774 out of 800. Does that mean the students' average score is 774？
1answer
44 views

### “it modulo” meaning in Math context?

What is the meaning of this sentence? Since the sum can be large, find it modulo 109 + 7.
1answer
2k views

### Meaning of “3e9 seconds” in this blog post? [closed]

I was reading a FaceBook note, Mastering Programming by a renowned software engineer Kent Beck. This is the 2nd paragraph. Here are ways effective programmers get the most out of their precious ...
1answer
46 views

### How to interprete a vector which “pointed down the middle of the data”?

In this tutorial (line three) it is hard for me to interpret what "point down the middle of the data" means. I know from the tutorial the mentioned vector (doted line in the following plot) is the one ...