The number of lightening strikes on a square kilometer of open ground in a year has mean 5 and standard deviation 2.1. The Natio nal Lightening Detection Network used automatic sensors to watch for lightening in a sample of 16 randomly chosen square kilometers. Q1): What are the mean and standard deviation of the mean number of strikes per square kilometer
1 answer:
Answer:
5 ; 0.525
Step-by-step explanation:
Given that :
Population Mean number of strikes per square kilometer (μ) = 5
Population standard deviation of strikes per square kilometer (σ) = 2.1
Sample size (n) = 16
The sample mean number of strikes per square kilometer (m) = mean Number of strikes per square kilometer in the population.
μ = m ; 5 = 5
Hence,
Sample mean = 5
Standard deviation = standard error = σ/√n
Standard Error = 2.1 / √16
Standard Error = 2.1 / 4
Standard Error = 0.525
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