The difference between a histogram and a frequency polygon is: A: the frequency polygon is reported as a percent, a histogram does not report percents. B: the histogram shows frequencies while a frequency polygon shows cumulative frequencies. C: the bars in a histogram and a frequency polygon cannot be adjacent. D: open-ended classes can be accommodated with a frequency polygon.

For<br/>a bar chart, we take _____ as the horizontal axis. () A: frequency B: relative<br/>frequency C: relative<br/>frequency density D: values<br/>of a variable

Which<br/>of the following is the Y-axis of the histogram?() A: frequency B: relative<br/>frequency C: relative<br/>frequency density D: values<br/>of a variable E: rate

frequency band

Which<br/>of the following can be used as the Y-axis of the bar chart? () A: frequency B: relative<br/>frequency C: relative<br/>frequency density D: values<br/>of a variable

The<br/>vertical axis of the histogram is () A: Frequency B: Relative<br/>frequency C: Relative<br/>frequency density D: The<br/>values of a variable E: The<br/>intervals of a variable

Design a low-pass digital filter for filtering analog signals. Its passband frequency is1.25kHz，and stopband frequency is 3.4kHz.The sampling frequency is 8kHz.The normalized cutoff frequency of the digital low-pass filter is ( ) A: ωp=2500π，ωs=6800π B: ωp=2500π，ωs=0.85π C: ωp=0.3125π，ωs=6800π D: ωp=0.3125π，ωs=0.85π

Frequency can be measured by UT801 multi-meter.

The difference between a histogram and a frequency polygon is:

40 .which frequency in the medium frequency band is used for distress and safety traffic by radiotelephony? A: . 2182kHz B: .518kHz C: 6090kHz D: 2614kHz