Question

A box contains 600 screws , one tenth of them are rusted . One screw is taken out of a random from this box. Find the probability that it is a good one​

Answer 1

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ANSWER

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SOLUTION:-

• TOTAL SCREWS= 600

• RUSTED SCREWS ARE ONE TENTH OF IT =
• $1 \div 10 \times 600 = 60$
• GOOD SCREWS= (600-60)=540

• PROBABILITY (GOOD SCREW)=
• $540 \div 600 =$
• 9/10(ANSWER)

DETAILED ANSWER:-

• Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur, or how likely it is that a proposition is true. The probability of an event is a number between 0 and 1, where, roughly speaking, 0 indicates impossibility of the event and 1 indicates certainty

• How to calculate probability

• Determine a single event with a single outcome.

• Identify the total number of outcomes that can occur.

• Divide the number of events by the number of possible outcomes.

Answer 2

Question :

A box contains 600 screws , one tenth of them are rusted . One screw is taken out of a random from this box. Find the probability that it is a good one

To find :

the probability that it is a good screw

Solution :

Total no of screws = 600

$\sf \small no \: of \: screws \: rusted = \frac{1}{10}$

$\frac{1}{10} \times 600$

$60$

Therefore 60 screws got rusted

No of good screws → Total screws – Rusted Screw

→ 600 – 60

→ 540

No of good screws is 540

$\sf \small Probability \: of \: getting \: one \: good \: screw = \frac{no. \: of \: good \: screws}{total \: no \: of \: screws}$

$\sf \small \: Probability = \frac{540}{600}$

$\sf \small \therefore \: the \: probability \: is \: \frac{9}{10}$