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Evgesh-ka [11]
3 years ago
14

Which statement about the best estimation strategy for this problem is correct? The Jackson family drove 490 miles each day for

9 days. They then flew 1,292 miles. How far did the Jackson family travel? A student answered 5,702 miles.
Mathematics
1 answer:
dalvyx [7]3 years ago
6 0
The answer is 4,172
First of all i did 490x9=2880
Then i did 2880+1292=4172
4172
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The answer is A. I hope this helps, have a great day!

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Write a word problem for x/2+4=12
dezoksy [38]

Answer:

Four more than half a number is twelve

Step-by-step explanation:

Four more than half a number is twelve

5 0
3 years ago
The prices of all college textbooks follow a bell-shaped distribution with a mean of $113 and a standard deviation of $12. Using
Soloha48 [4]

Step-by-step explanation:

In statistics, the empirical rule states that for a normally distributed random variable,

  • 68.27% of the data lies within one standard deviation of the mean.

  • 95.45% of the data lies within two standard deviations of the mean.

  • 99.73% of the data lies within three standard deviations of the mean.

In mathematical notation, as shown in the figure below (for a standard normal distribution), the empirical rule is described as

                             \Phi(\mu \ - \ \sigma \ \leq X \ \leq \mu \ + \ \sigma) \ = \ 0.6827 \qquad (4 \ \text{s.f.}) \\ \\ \\ \Phi(\mu \ - \ 2\sigma \ \leq X \ \leq \mu \ + \ 2\sigma) \ = \ 0.9545 \qquad (4 \ \text{s.f.}) \\ \\ \\ \Phi}(\mu \ - \ 3\sigma \ \leq X \ \leq \mu \ + \ 3\sigma) \ = \ 0.9973 \qquad (4 \ \text{s.f.})

where the symbol \Phi (the uppercase greek alphabet phi) is the cumulative density function of the normal distribution, \mu is the mean and \sigma is the standard deviation of the normal distribution defined as N(\mu, \ \sigma).

According to the empirical rule stated above, the interval that contains the prices of 99.7% of college textbooks for a normal distribution N(113, \ 12),

                \Phi(113 \ - \ 3 \ \times \ 12 \ \leq \ X \ \leq \ 113 \ + \ 3 \ \times \ 12) \ = \ 0.9973 \\ \\ \\ \-\hspace{1.75cm} \Phi(113 \ - \ 36 \ \leq \ X \ \leq \ 113 \ + \ 36) \ = \ 0.9973 \\ \\ \\ \-\hspace{3.95cm} \Phi(77 \ \leq \ X \ \leq \ 149) \ = \ 0.9973

Therefore, the price of 99.7% of college textbooks falls inclusively between $77 and $149.

5 0
2 years ago
800 is 10 times as much as what
Margaret [11]
800 is 10 times as much as 80
8 0
2 years ago
Clare paid full price for an item. Han bought the same item for 80% of the full price. Clare said, I cants believe I paid 125% o
Anettt [7]

Answer:

The statement is True!

Step-by-step explanation:

Clare paid full price for an item.

Let Price of the item = x

Han bought the same item for 80% of the full price.

Han bought it for 0.8x

Clare said, I cants believe I paid 125% of what you paid, Han!

The above statement is True if;

125% of 0.8x = x

1.25   *  0.8x = x

x =x

The statement is True!

3 0
3 years ago
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