The probability that a random sample of 12 second grade students results in a mean reading rate of more than 95 words per minute is 0.4582.
Given that the population mean,
= 90 wpm
The standard deviation of the population ,
= 10
Sample size, n = 12
Sample mean,
= 95
The reading rate of students follows the normal distribution.
Let z = 
= 
= 1.732
Probability that the mean reading exceeds 95 wpm = P(
>95)
= P(z>1.732)
= 1- P(z<1.732)
= 0.4582
[The value 0.4582 found from the area under the normal curve using tables].
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Circumference of the entire circle = 2 * PI * radius
circumference = 2 * PI * radius
circumference =
<span>
<span>
<span>
62.832
81 degrees is (81 / 360) or .225 of the entire circumference
so the 81 degree arc = .225 * 62.832 = 14.137 feet
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Answer:
4 × 3 - 2 × 5 = 12 - 10 = 2
2x² + 3y² = 2 × 9 + 3 × 25 = 18 + 75 = 93
Answer: 9 units
Step-by-step explanation: