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3 years ago

11

M and m A) 150° C) 131° B) 180° D) 161° Please I need help right now pleaseeeeee

1 answer:

Alex777 [14]3 years ago

6 0

Ugh i don’t understand add a picture to this so that we could understand the question clearly.

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3 years ago

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The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in t

Irina-Kira [14]

Answer:

The correct option is B) 0.0228

Step-by-step explanation:

Consider the provided information.

The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation is known to be 0.5 minute.

Thus, the value of n = 100, $\bar x=3.1$ and σ = 0.5

We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.

The null and alternative hypotheses are,

$H_0:\mu\leq3$ and $H_a:\mu>3$

Compute the test statistic $z=\frac{\bar x-\mu}{\frac{\sigma}{\sqrt{n}}}$

$z=\frac{3.1-3}{\frac{0.5}{\sqrt{100}}}$

$z=\frac{0.1}{0.05}$

$z=2$

By using the table.

P value = P(Z>2) = 0.0228

Hence, the correct option is B) 0.0228

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3 years ago