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2 years ago

10

A random sample of 50 cars in the drive-thru of a popular restaurant Amrik-Sukhdev revealed an average bill of Rs 600 per car. T

he population standard deviation is 150. Estimate the mean bill for all cars from the drive-thru with 98% confidence.

1 answer:

Basile [38]2 years ago

4 0

I think it has to be 45.

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7k=77 solve the equation check your soulution

SOVA2 [1]

You just divide both sides by 7:

7k/7 = 77/7

k = 77/7

k = 11

Final answer: k = 11

6 0

3 years ago

Which of the following scenarios demonstrates an exponential decay? A. A tennis tournament in which after each round, half the p

Sliva [168]

Answer:

A. A tennis tournament in which after each round, half the players are eliminated.

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

The core melt- down and explosions at the nuclear reactor in Chernobyl in 1986 released large amounts of strontium-90, which dec

elena-14-01-66 [18.8K]

If $S(t)$ is the amount of strontium-90 present in the area in year $t$ , and it decays at a rate of 2.5% per year, then

$S(t+1)=(1-0.025)S(t)=0.975S(t)$

Let $S(0)=s$ be the starting amount immediately after the nuclear reactor explodes. Then

$S(t+1)=0.975S(t)=0.975^2S(t-1)=0.975^3S(t-2)=\cdots=0.975^{t+1}S(0)$

or simply

$S(t)=0.975^ts$

So that after 50 years, the amount of strontium-90 that remains is approximately

$S(50)=0.975^{50}s\approx0.282s$

or about 28% of the original amount.

We can confirm this another way; recall the exponential decay formula,

$S(t)=se^{kt}$

where $t$ is measured in years. We're told that 2.5% of the starting amount $s$ decays after 1 year, so that

$0.975s=se^k\implies k=\ln0.975$

Then after 50 years, we have

$S(50)=se^{50k}\approx0.282s$

5 0

3 years ago

The perimeter of a square closet is 12 m. What is the cost of carpeting it at $7.00 per square meter

snow_lady [41]

Area= 12m * 12m = 144m^2 *7.00$ = 1008$.
Final answer: 1008$

5 0

3 years ago

(5 – 3x)4 – 2<br><br> Please I need help. Show steps im so confused

RSB [31]

Answer:

6

Step-by-step explanation:

P (5-3) =2

E X

M 2 x 4 =8

D X

A X

S 8 - 2 =6

6 0

2 years ago