What's the nearest ten to the number 907

2 answers:

5 0

The nearest ten to 907 is 910. For future reference, any number that is equal to or greater that 5 will round up, adding one to the next largest spot. For example if I took 835, it would round to 840. But if the number is less than 5, you want to round down. Say I had 392, it would round to 390.

tatiyna3 years ago

4 0

The answer would be 910 because numbers 1-4 round down to the nearest tenth and numbers 5-9 round up to the nearest tenth. This number ends in 7, so we would round up to the nearest tenth. This would make the correct answer 910

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The lifetimes of a certain type of calculator battery are normally distributed. The mean lifetime is 400 days, with a standard d

Licemer1 [7]

Complete question :

The lifetimes of a certain type of calculator battery are normally distributed. The mean lifetime is 400 days, with a standard deviation of 50 days. For a sample of 6000 new batteries, determine how many batteries will last: 360 and 460 days

Answer:

0.67307

Step-by-step explanation:

Given that :

Mean, m = 400

Standard deviation, s = 50

Sample size, n = 6000

Obtain the standardized score :

Zscore =(x - m) / s

For X = 360

P(x < 360)

Zscore =(360 - 400) / 50

Zscore = - 40 / 50

Zscore = - 0.8

P(Z < - 0.8) = 0.21186

For X = 460

P(x < 460)

Zscore =(460 - 400) / 50

Zscore = 60 / 50

Zscore = 1.2

P(Z < 1.2) = 0.88493

P(Z < 1.2) - P(Z < - 0.8)

0.88493 - 0.21186

= 0.67307

5 0

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Suppose that pulse rates among healthy adults are normally distributed with a mean of 80 beats/second and a standard deviation o

olga_2 [115]

Answer:

0.3520

Step-by-step explanation:

We have been given that the pulse rates among healthy adults are normally distributed with a mean of 80 beats/second and a standard deviation of 8 beats/second. We are asked to find the proportion of healthy adults have pulse rates that are more than 83 beats/sec.

First of all, we will find z-score corresponding to sample score of 83 as:

$z=\frac{x-\mu}{\sigma}$ , where,