Answer:
4. x = 7.5
5. x = 17.9
6. x = 18.4
Step-by-step explanation:
4. Cos(60) = x/15
x = 15*Cos(60)
x = 7.5
5. Tan(50) = x/15
x = 15*Tan(50)
x = 17.9
6. Cos(57) = 10/x
x = 10/Cos(57)
x = 18.4
Y=25x
i hope this is what you’re asking for
Answer:
Upper limit 150
Lower bond 136
Step-by-step explanation:
Hello!
The study variable is:
X: measurement of IQ of a statistic instructor.
This variable has a normal distribution:
X~N(μ; σ²)
And the population standard deviation is known σ= 16
You need to construct a confidence interval for the population mean, for this, since the variable has a normal distribution and the population variance is known, the statistic to use is the standard normal
Z= X[bar] - μ ~N(0;1)
σ/√n
The formula for the interval is:
X[bar] ± *
Where
X[bar] is the sample mean
is the value under the Z distribution for the corresponding confidence level.
S is the population standard deviation. (should be sigma but it doesn't recognize the symbol)
[143 ± 1.96 * ]
[135,988; 150. 012] ≅ [136; 150]
I hope it helps!