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I toss a fair coin until I get two head in a row. What is the probability that I toss the coin 5 times in total?

In order to satisfy the condition, must have the 4th toss and 5th toss both being heads. Note that the 3rd toss must be tails as otherwise we would terminate the coin tosses prematurely. This leaves the firs...
JX
Answered by James X. • Maths tutor
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Describe the mechanism of a reflex action.

A receptor detects a stimulus and generates electrical signals which are conducted by the neurones in the reflex arc. Firstly, the sensory neurone conducts the signal to the spinal cord. There is then a syna...
EG
Answered by Ella G. • Biology tutor
3296 Views

Please give 1 reason against storing Business data on USB drive

Storing Business data on a USB drive is risky, as USBs can be easily lost or misplaced. If a Businesses USB was lost, the data could get into the wrong hands, which could potentially damage the business and ...
JS
Answered by Joseph S. • ICT tutor
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what is a half life of a substance and how can you work it out.

A half life of a substance is the time it takes for the mass of a radioactive substance to decrease by half. Say you have 50g of carbon-14, you are looking for the amount of time it takes for the mass to rea...
SW
Answered by Samuel W. • Physics tutor
2425 Views

How to draw two linear lines and find where they cross without using the graph.

So, for a standard liner function, Y=mx+c, where Y is the output, m is the gradient or slope of our line, x is the input value and c is our y-intercept, where our line crosses the Y-axis. So, we have two equ...
SW
Answered by Samuel W. • Maths tutor
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