Q1
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Samples of aluminum-alloy channels are tested for stiffness. Stiffness is normally distributed. The following frequency distribution is obtained.
| stiffness | frequency |
|---|---|
| 2480 | 23 |
| 2440 | 35 |
| 2400 | 40 |
| 2360 | 33 |
| 2320 | 21 |
What is the approximate probability that the stiffness of any given channel section is less than 2350?