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ycow [4]
3 years ago
12

Estimate 349+388 then calculate the exact results without using a calculator ​

Mathematics
1 answer:
morpeh [17]3 years ago
5 0

Answer:

730

Step-by-step explanation:

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In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta restaurant, data were collected for a
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Answer:

95% Confidence interval = (23.4,26.2)

Step-by-step explanation:

In this problem we have to develop a 95% CI for the mean.

The sample size is n=49, the mean of the sample is M=24.8 and the standard deviation of the population is σ=5.

We know that for a 95% CI, the z-value is 1.96.

The CI is

M-z*\sigma/\sqrt{n}\leq\mu\leq M+z*\sigma/\sqrt{n}\\\\24.8-1.96*5/\sqrt{49}\leq\mu\leq 24.8+1.96*5/\sqrt{49}\\\\ 24.8-1.4\leq\mu\leq 24.8+1.4\\\\23.4\leq\mu\leq 26.2

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A toy plane moves at a constant speed of 2m/s. How long will it travel a distance of 42 meters?
Tpy6a [65]

Answer:

option A. 21 sec

Step-by-step explanation:

Speed = the distance over the time

Given:

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So,

2 = 42/t

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Which of the following displays cannot be used to compare data from two different sets?
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Scatter plot charts are good for relationships and distributions, but pie charts should be used only for simple compositions — never for comparisons or distributions.

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