The length of a text messaging conversation is normally distributed with a mean of 2 minutes and a standard deviation of 0.5 min
1 answer:
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a)
the average speed, well it does 10 ft in 1.6 secs, so is simply their quotient, 10/1.6 = 6.25 ft/s on average.
b)
over the horizontal, well, it covered horizontally 9.25 ft in those 1.6 secs, so their quotient is 9.25/1.6 = 5.78125 ft/s on average.
c)
we don't know the vertical distance, but
so, it covered vertically about 3.8 ft in those 1.6 secs, so then 3.8/1.6 = 2.375 ft/s on average
Answer: 1067
Step-by-step explanation:
Given : Level of confidence = 0.90
Significance level :
By using the normal distribution table,
Critical value :
Margin of error :
The formula to find the population proportion if prior proportion of population is unknown :-
Hence, the company should survey minimum sample having size =1067