Standard Deviation

Question 1

The histogram shows the weekly rates charged by different daycares for a 2-year-old child.

Revolt · Accepted Answer

nearly symmetrical

Question 2

Which weights are within 2 standard deviations of the mean? Select three options.

Revolt · Accepted Answer

8.9 lbs; 9.5 lbs; 10.4 lbs

Question 3

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 4

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 5

The graph shows a distribution of data.

Revolt · Accepted Answer

0.0625

Question 6

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 7

Each histogram represents a set of data with a median of 29.5. Which set of data most likely has a mean that is closest to 29.5?

Revolt · Accepted Answer

A graph shows the horizontal axis numbered 15 to 48. The vertical axis is numbered 1 to 5. The graph shows an upward trend from 1 to 30 then a downward trend from 30 to 45.

Question 8

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 9

The mean shoe size of the students in a math class is 7.5. Most of the shoe sizes fall within 1 standard deviation, or between a size 6 and a size 9.

Revolt · Accepted Answer

1.5

Question 10

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.

Standard Deviation Answers

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