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Sergeu [11.5K]
3 years ago
6

According to an article in Marketing News, fewer checks are being written at the grocery store checkout than in the past. To det

ermine whether there is a difference in the proportion of shoppers who pay by check among three consecutive years at a 0.05 level of significance, the results of a survey of 500 shoppers in three consecutive years are obtained and presented below.
Year
Check Written Year 1 Year 2 Year 3
Yes 225 175 125
No 275 325 375

Referring to the above table, what is the expected number of shoppers who pay by check in year 1, if there is no difference in the proportion of shoppers who pay by check among the three years?

Select one:

a. 150

b. 187.5

c. 175

d. 225
Mathematics
1 answer:
garik1379 [7]3 years ago
4 0
I dont know man...im tryna answer questions so i can ask mine :(
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With the curve C parameterized by

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\displaystyle\int_C\mathbf f\cdot\mathrm d\mathbf r=\int\limits_{t=0}^{t=\pi/2}\mathbf f(x(t),y(t),z(t))\cdot\frac{\mathrm d\mathbf r(t)}{\mathrm dt}\,\mathrm dt

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\displaystyle\int_0^{\pi/2}(15\sin t\,\mathbf i+13\sin^2t\,\mathbf j+12\sin^3t\,\mathbf k)\cdot(15\cos t\,\mathbf i+13\sin2t\,\mathbf j+18\sin t\sin2t\,\mathbf k)\,\mathrm dt
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Which relationship describe angles 1 and 2
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Step-by-step explanation:

8 0
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In the second choice,since we removed one grape there is now a total of 21 grapes (22-1), 8 of which are green. Therefore the probability of the second chosen grape being green is \frac{8}{21}

Now we multiply both probabilities together to calculate the probability that both grapes are green in a sequence.

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