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Alexandra [31]
2 years ago
9

The corner grocery store sells oranges for $2.18 per pound. Select the stores that sell oranges at a lower unit price. Mark all

that apply.
A.
Store A: $6.08 for 4 pounds
B.
Store B: $4.47 for 3 pounds
C.
Store C: $12.56 for 4 pounds
D.
Store D: $7.52 for 4 pounds
Mathematics
1 answer:
ycow [4]2 years ago
7 0

Answer:

A , B, and D

Step-by-step explanation:

you find the unit prices by dividing the cost per pound

a bc it sells them at $1.52 per pound

b bc it sells them at $1.49 per pound

NOT c because it sells them at $3.14 per pound

D because it sells them at $1.88 per pound

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Step-by-step explanation:

We are given that an appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W with a population standard deviation of 15 W.

They take a sample of 20 microwave ovens and find that they consume a mean of 257.3 W.

Let \mu = <u><em>mean power consumption for microwave ovens.</em></u>

So, Null Hypothesis, H_0 : \mu \leq 250 W     {means that a compact microwave oven consumes a mean of no more than 250 W}

Alternate Hypothesis, H_A : \mu > 250 W     {means that a compact microwave oven consumes a mean of more than 250 W}

The test statistics that would be used here <u>One-sample z test statistics</u> as we know about the population standard deviation;

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where, \bar X = sample mean power consumption for ovens = 257.3 W

            σ = population standard deviation = 15 W

            n = sample of microwave ovens = 20

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The value of z test statistics is 2.176.

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