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3 years ago

2. A sound wave in a steel rail has a frequency of 620 Hz and a wavelength of 10.5 m. What

Physics

2 answers:

Alex3 years ago

5 0

Answer:Speed of sound in steel is 6510m/s.

Explanation:

Speed, v= frequency,f÷ wavelength

v=?, f= 620, wavelength= 10.5

v= 620× 10.5

= 6510m/s

den301095 [7]3 years ago

5 0

V=f¥
=620x10.5
V=6510m/s

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Answer:

a) $P(6)=0.25$

b) $p(x$

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Explanation:

From the question we are told that:

Population percentage $p_\%=\60%$

Sample size $n=10$

Let x =customers ask for water

Let y =customers dose not ask for water with their meal

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Generally the equation for pmf p(x) is mathematically given by

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Generally the probability that exactly 6 ask for water is mathematically given by

$P(x)6=10C_6 (0..6)^6(0.4)^{10-6}$

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Generally the probability that less than 9 ask for water with meal is mathematically given by

$p(xg)$

$p(x$

Generally the probability that at least 3 ask for water with meal is mathematically given by

$p(x\geq3)=1-p(x$

$p(x\geq3)=1-[p(0)+p(1)+p(2)]$

$p(x\geq3)=1-[0.00001+0.0015+0.0106]$

$p(x\geq3)=1-[0.0122]$

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Mean

$\=x=np=10(0.6)=6$

Standard deviation

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$\sigma=\sqrt{2.4}=1.5492$

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