Answer:
no its bbac
Step-by-step explanation:
<h2>
Answer : (2.67, 3.53)</h2><h2>
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Step to step explanation:
Confidence interval for mean, when population standard deviation is unknown:

, where
= sample mean
n= sample size
s= sample standard deviation
= Critical t-value for n-1 degrees of freedom
We assume the family size is normal distributed.
Given, n= 31 ,
, s= 1.42 ,

Critical t value for
and degree of 30 freedom
= 1.697 [By t-table]
The required confidence interval:

Hence, the 90% confidence interval for the estimate = (2.67, 3.53)
Answer: 42.84 kg
Step-by-step explanation: Lawn is 17 ft x 20 ft.
Its area is S = 17 x 20 = 340 ft²
Each ft² of lawn accumulates 1050 snowflakes/min, 1ft² = 1050 s.f./min.
As 1 hour has 60 min, the lawn accumulates 63000/hour →
1050 x 60 = 63000
1ft² = 63000s.f./hour
This way, 340 ft² of lawn will accumulate 21,420,000 s.f/hour →
340 x 63000 = 21420000
As 1 snowflake has 2mg, 21,420,000 will have 42,840,000 mg.
As 1kg = 1,000,000 mg
42,840,000/1,000,000 = 42.84 kg
Answer:
3x8= 24sf
5x7= 35sf
9x10= 90sf
13x2= 26sf
8x8= 64sf
Step-by-step explanation: