Standard Deviation

Question 1

Bryant collects a set of 20 values that represent the lengths of worms he found in the garden. The variance of the set of values is 36.What is the standard deviation from the mean? Round the answer to the nearest tenth if necessary.

Revolt · Accepted Answer

6

Question 2

The students in Marly’s math class recorded the dimensions of their bedrooms in a frequency table.

Revolt · Accepted Answer

The histogram is right-skewed, so the mean is greater than the median.

Question 3

Grace is looking at a report of her monthly cell-phone usage for the last year to determine if she needs to upgrade her plan. The list represents the approximate number of megabytes of data Grace used each month.700, 735, 680, 890, 755, 740, 670, 785, 805, 1050, 820, 750

Revolt · Accepted Answer

100

Question 4

The graph shows a distribution of data.

Revolt · Accepted Answer

0.0625

Question 5

The histogram shows a city’s daily high temperatures recorded for four weeks.

Revolt · Accepted Answer

left-skewed

Question 6

Raquel and Van live in two different cities. As part of a project, they each record the lowest prices for a gallon of gas at gas stations around their cities on the same day. Raquel’s data show and . Van’s data show and .Which statement is true about their gas-price data?

Revolt · Accepted Answer

Raquel’s data are most likely closer to $3.42 than Van’s data are to $3.78.

Question 7

The graph represents the distribution of the lengths of play times, in minutes, for songs played by a radio station over one hour.

Revolt · Accepted Answer

Most of the songs were between 3 minutes and 3.8 minutes long.

Question 8

A school creates a histogram representing the individual travel times for students riding the bus to school. The histogram is right-skewed, and the mean time is 25 minutes.

Revolt · Accepted Answer

The median time is less than 25 minutes.

Question 9

Which statements are true about a histogram with one-minute increments representing the data? Select three options.

Revolt · Accepted Answer

A histogram will show that the mean time is approximately equal to the median time of 7.5 minutes.; The shape of the histogram can be approximated with a normal curve.; The histogram will show that most of the data is centered between 6 minutes and 9 minutes.

Question 10

The graph shows a distribution of data.

Revolt · Accepted Answer

0.5

Standard Deviation Answers

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