Điểm bài kt môn Toán HKI của 32 học sinh lớp 7A đc ghi trong bảng sau:
7 4 4 6 6 4 6 8
8 7 2 6 4 8 5 6
9 8 4 7 9 5 5 5
7 2 7 6 7 8 6 10
a)Dấu hiệu ở đây là gì ?
b)Lập bảng "tần số"
c)Tính số TB cộng và tìm mốt của dấu hiệu
d)Vẽ biểu đồ đoạn thẳng
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a. Dấu hiệu: Điểm kiểm tra môn Toán của mỗi hs lớp 7A.
b.
Giá trị | 2 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|
Tần số | 2 | 4 | 8 | 6 | 4 | 5 | 2 | 1 | N= 32. |
Nhận xét:
Số điểm đạt nhiều nhất là 5 với 8 hs.
Số điểm đạt ít nhất là 10 với 1 hs.
c.
Trung bình cộng= (2 . 2 + 4 . 4 + 5 . 8 + 6 . 6 + 7 . 4 + 8 . 5 + 9 . 2 + 10 . 1) : 32= 6.
Mốt= 5
d. tự vẽ
a, dấu hiệu là điểm kt môn toán của từng học sinh
b,
giá trị | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
tần số | 3 | 5 | 4 | 7 | 7 | 5 | 2 | 1 |
Giá trị có tần số lớn nhất là: 6, 7
Giá trị có tần số nhỏ nhất là: 10
Có 8 giá trị khác nhau
Có 34 giá trị
c, 3.3+4.5+5.4+6.7+7.7+8.5+9.2+10343.3+4.5+5.4+6.7+7.7+8.5+9.2+1034 ≈≈ 6,12
d, 8 : 3410034100 = 8 : 17501750 ≈≈ 23,5
=> Số điểm dưới trung bình chiếm xấp xỉ 23,5%
e ) tự vẽ
a) Dấu hiệu cần tìm : Điểm kiểm tra 1 tiết môn toán của 30 hs lớp 7a
b)
Giá trị (x) | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
Tần số (n) | 1 | 3 | 2 | 5 | 6 | 7 | 3 | 3 | N=30 |
c) X= 7 ( bạn tự ghi phép tính ra nhá )
d) Mốt của dấu hiệu là: 8
a) Lớp 7A có 3.10=30 học sinh
b)
Số điểm(x) | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Tần số (n) | 1 | 2 | 3 | 4 | 8 | 6 | 4 | 2 |
- Số trung bình cộng của dấu hiệu là:
\(\overline{X}=\dfrac{3.1+4.2+5.3+6.4+7.8+8.6+9.4+10.2}{30}=7\)
- Mốt của dấu hiệu là 7
a) Lớp 7A có 30 bạn học sinh
b)
Số điểm(x) | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Tần số (n) | 1 | 2 | 3 | 4 | 8 | 6 | 4 | 2 |
- Số trung bình cộng của dấu hiệu là:
¯¯¯¯¯X=3.1+4.2+5.3+6.4+7.8+8.6+9.4+10.2:30=7
- Mốt của dấu hiệu là 7
- Dấu hiệu: Điểm kiểm tra Toán lớp 7A.
- Lớp 7A có: 27 học sinh.
- Bảng tần số:
Giá trị (x) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Tần số (n) | 1 | 1 | 4 | 3 | 4 | 4 | 3 | 3 | 3 | 1 |
Số trung bình cộng:
X = 1x1+2x1+3x4+4x3+5x4+6x4+7x3+8x3+9x3+10x1
_______________________________________
27
= 1 + 2 + 12 + 12 + 20 + 24 + 21 + 24 + 27 + 10
______________________________________
27
= 5,7
a) Dấu hiệu là điểm bài kiểm tra môn Toán HKI của mỗi em học sinh lớp 7A
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2oAJ31IMnEKoPoP1+q7FFZcjmV65n+aUubWGddvdMzJ89svNyCxD3u2TqdCxujOZ7mobZut0UMcywkgMMT18+emu3m7U2WMlvk6y8ozvt/nBBcDPDi6kKfASbKec/RrAxncVgRb4/7/hJYPzGCxU5nk7zPRwUaWS/XT+h0ulc9v0VGs+vWzVKOo6fGPfUszdLj0XrXRae1PHexRcv8sTEtLbeMn7dWoZQa47D3eFmDxMMUgwIkpzbGFuLQ7NoijPYu201gMTLQvlH4P6Bmi4wHXRRE6oB7FGL6moNriSowTNlsfFQNIrMNTjlqwiK7dg19yXmQIFYG8d4+grEHT/3lih/klCTd07HSy1ngmGNLq0pYO2D6j+Q5YHtnxAtvtWgSZyFmeW7VnAbpC4uJ8lfdDhTN8bwcp1mqjV3cXJzv1d3d2Ridn+/7/UTQeLZGE8gvu5do/DjMaPGFbbDVB6qU48wXMSvs3TWI/nWREHEpmwnbINQ+4RCobcPzi3ezSb65RsyhwxYlg/htH6LtMfHSXy7DOTaB51nbJAkBug2xGAn0TJO+hmk05F6nO9aJtk847BkAvNsmGCNDxdPCJ4JTktIb1PNA7RtHWT0ioslGIUWpmaUe+FqHG4youk82G46wDUKtlu6InuYsUWOSaj0LzTWeOXgxgW1Ccdk+ArHHY3+ZwtQ9N+h6r02SqAtYGDIiZZprxMxBwBzJB0TdwIWDPxKuTwSMIfmQWKXl0VmJjhhiC3Gczh7E6bT2qbY+6B9QivlLhfKMsbJvd5ijEZZtMCwgMD4/PB5fH0GexeGmfQi3x0d/udqRdeMbasQpt1440vTc0J1+7VJOALWvdQ15mFMe5sRtyObMdZ22SZb6vnOn0Eu4m2L8d4B01b7u0R3045RbJyFII2ZUvcoTF5Gb6K33TpzyMKYrG8TEX3+54pH1JJij+Hy166CjERbpb8jt42Ngnvlhb3DI99zS3tmhOaocx+j567XEKi2fOaxiIwYjVc3h9H8qj0j1EFWDwGyDaIqHCWhu79plQCMgeXhv/OAV3Fkc7tqHOHv895erHVkbUW53IW6PggDNul15YNudpDvILMtpgCRPynF7tkZ7k0elgzGpTkmW8wM6gEtaRweQiOFP+rY0PB8RtYl3J7FHoSdzp1157MpRTd9BTt6iahCZxztH8WmvPm30LYeZKWKyL/y3DzH2iOkvl+EvxbjcweiCaI79egstk0IrAcT1zQylY3+PvXePw1gE7eKTOOVWdzSNFl/Q4gGxWARzY1li4A5LO+nlLNR22GnnvMk27U3Wa5Cv+3SwxiKprsmv9f3Y1VZ4/KQkzbGQ2CKjWQdYXXpwWj9Td0SqGVV7eMdCnUF6g04dtEwEczNnorxLx6EkJEZ28N8+hNgjqL8ElrrX3mQppmenAFDS/aETn9SL1ul0On0faror1H8UwgJOKJxSWUpRWtz0tMuyu/132DRsrqdeu+UGyd///prbt/+F2dmbnJ0dBVpWLz/99DN37vwrH374T7x69T8TLduKpkUA6HROQrPh1atf+Oijz0KvC4C//vX/mJv7d37/+3/mb39rjv/CFbAnzH7Si729dh36JdesRWJML70cyHQRVfs9F0Q8YSb7qyNSu8h0BKepEctyRKoM9lzxTTGXECNPtJZxeURqbI2mxzzooAlz4USmY0HDRqa6mM5sEH9chgXGkZr1999/z507v/C7391mZmZmUjaFin7YlJsv6IdVycq1a9dIpf4tlLJl6QDJ5B9CLR/kqQuwOkc5ImsZ7AmznwC8ffuWV69+4YcfXg29Z6BmfevWLV6/fh2ocQqFQqEYzOzsLGdnZ7bPBsog9Xqd+/fvE41GuXv37sXCmEKhUCjEo2kad+/eJRqNcv/+fer1ev89gyJrhUKhUMiFWmBUKBSKS4By1gqFQnEJUM5aoVAoLgH/Dxw/YPbIgv6GAAAAAElFTkSuQmCC)
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)
b)
c) _
X = \(\dfrac{2.2+4.5+5.4+6.7+7.6+8.5+9.2+10}{32}\)= 6,125
Mốt = Mo = 6
d)
xin tích ạ...