Zachary adds 26.45 g to 2.55 g. How many significant figures should his answer have?

2 answers:

8 0

26.45 + 2.55 = 29 . . . but with correct sig figs . . . the answer is . . . 29.00 . . . i.e. [4] sig figs

. . . why? . . . because even though 26.45 has [4] sig figs & 2.55 has [3] sig figs, the number of sig figs to the right of the decimal are the critical sig figs . . . and there are [2] sig figs to the right of the decimal, so the answer/result can also beas precise as having [2] sig figs to the right of the decimal as well.

siniylev [52]3 years ago

8 0

Answer:

C. 4

Step-by-step explanation:

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Assume that 75 was the mean test score on an exam, with a standard deviation of 4 points.

Tems11 [23]

Answer:

68%

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

Approximately 68% of the measures are within 1 standard deviation of the mean.

Approximately 95% of the measures are within 2 standard deviations of the mean.

Approximately 99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean of 75, standard deviation of 4.

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67 = 71 - 4

75 = 71 + 4

Within 1 standard deviation of the mean, so, by the Empirical Rule, 68%.

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2 years ago

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Answer:

The minimum sample size required is 207.

Step-by-step explanation:

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