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bagirrra123 [75]
2 years ago
15

A pencil case for £3.99 a packet of pens for £2.49 a calculator for 4.99 she pays with a £20 note how much change will she recei

ve
Mathematics
2 answers:
borishaifa [10]2 years ago
8 0

Answer:

She will recive £ 8.53 in change.

Step-by-step explanation:

£3.99 + £2.49 + £4.99 =  £11.47

^ (All the prices combined to subtract later)

 £20.00 - £11.47  =  £8.53

^( You would subtract  £11.47 from  £20.00 to find out the change)

Hope this helped! If u have any questions feel free to ask!

meriva2 years ago
5 0

Answer:

£20 - ( 2.49 + 4.99 + 3.99)

= 20 - 11.47

= £8.53.

Step-by-step explanation:

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Answer:

a) The probability that at least 5 ties are too tight is P=0.0432.

b) The probability that at most 12 ties are too tight is P=1.

Step-by-step explanation:

In this problem, we could represent the proabilities of this events with the Binomial distirbution, with parameter p=0.1 and sample size n=20.

a) We can express the probability that at least 5 ties are too tight as:

P(x\geq5)=1-\sum\limits^4_{k=0} {\frac{n!}{k!(n-k)!} p^k(1-p)^{n-k}}\\\\P(x\geq5)=1-(0.1216+0.2702+0.2852+0.1901+0.0898)\\\\P(x\geq5)=1-0.9568=0.0432

The probability that at least 5 ties are too tight is P=0.0432.

a) We can express the probability that at most 12 ties are too tight as:

P(x\leq 12)=\sum\limits^{12}_{k=0} {\frac{n!}{k!(n-k)!} p^k(1-p)^{n-k}}\\\\P(x\leq 12)=0.1216+0.2702+0.2852+0.1901+0.0898+0.0319+0.0089+0.0020+0.0004+0.0001+0.0000+0.0000+0.0000\\\\P(x\leq 12)=1

The probability that at most 12 ties are too tight is P=1.

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Answer:

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Step-by-step explanation:

Using the sine ratio in the right triangle

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