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simulate 1 million tests of three fair coin flips
tests = np.random.randint(2, size=(int(1e6), 3))
sums of all tests
test_sums = tests.sum(axis=1)
proportion of tests that produced exactly one head
(test_sums == 2).mean()
if heads is represented by 0 then any test containing only one heads will contain one 0 and two 1, thus their sum will be exactly 2
more descriptive way of writing the code would be to check every occurrences of head
heads = tests == 0
then sum the occurrences per test
heads_per_test = heads.sum(axis= 1)
and see where total occurrences are exactly 1
(heads_per_test == 1).mean()
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I have a table in postgresql which contains scores of students and I wanna show scores less than 10 with word 'failed' and more than 10 with the word 'passed'. How can I do that using a query?
As result I want a table with two columns. First scores and second 'passed' or 'failed'.
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I want to write where condition in a SQL Server query which has following conditions:
Where paymentmode='Bank' and Status not equal to Paid
payment mode='cash' and sataus not equal to completed
How I can write these 4 condition b
We put the sets of conditions in brackets. In the following either all the conditions in the first parenthesis must be met or all those in the second.
Where
(paymentmode='Bank'
and Status <> 'Paid')
Or
(paymentmode='cash'
and status <> 'completed')
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How to find amount exclusive of tax from an amount inclusive of tax?
Currently I'm using this query and getting the desired result.
I am searching for a simple query.
My current query:
select #amountExclusiveOfTax=
(#amountInclusiveOfTax) -
((#amountInclusiveOfTax) - (((#amountInclusiveOfTax)/#taxPercent+100) * 100))
Is there any easier way?
This was taught in day one of my business math class:
SELECT #amountExclusiveOfTax = #amountInclusiveOfTax / (1 + #taxPercetange / 100)
This assume your #taxPercentage is stored in percentage form. For example, if the tax is 15%, then #taxPercentage = 15. Another popular form is the decimal form, where it's stored as 0.15.
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This is an assignment I must complete in CSP and I'm completely dumbfounded as to how to do it:
"Get two numbers from the user. The first will be the number to count up to, the second will be the number to count by.
For example, the user gives the numbers "20" and "3"
1
4
7
10
13
16
19
Note: it didn't actually reach 20."
Seems pretty standard
for i = start, finish, increment do
print(i)
end
Is a for loop, so just substitute finish and increment with the numbers and set start to 1
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I am trying to figure out how to choose between two things based on a percentage, but I don't know how to code it correctly. I am trying to choose between item a and item b when the chance of item a being chosen is 33.33% and item b is 66.67%. I'm not sure if I should use if else statements or something else. I would like to know how to code it in objective c, but any advice would be helpful.
Thanks
If the percentages are fixed, it's quite easy:
int result = (arc4random_uniform(3) == 0) ? a : b;
Essentially, this says "if a uniformly distributed non-negative integer strictly less than 3 is exactly equal to 0 (which happens 1/3 of the time), then the value of this expression is a, else it is b".