Historically, these bolts have an average thickness of 10.1 mm. A recent random sample of 10 bolts yielded these thicknesses: (Data EX0406) 9.7 9.9 10.3 10.1 10.5 9.4 9.9 10.1 9.7 10.3 (a) (1 point) Find the sample mean and standard deviation for these data.

So, the sample mean is 9.99.

So, the  standard deviation is 0.32.

Step-by-step explanation:

From Exercise we have the next numbers:  9.7 9.9 10.3 10.1 10.5 9.4 9.9 10.1 9.7 10.3.

So, N=10, because we have 10 numbers.

We calculate the sample mean:

So, the sample mean is 9.99.

We use the formula for standard deviation:

Now, we calculate the sum

Therefore, we get

So, the  standard deviation is 0.32.

answer: yes, he is correct

step-by-step explanation: 10x-1=59

                                              1-1=0     59+1=60

60/10=x=6

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step-by-step explanation: